1994 Mustang GT 5.0HO - Idle issue - Seeking advice

Mrlilwheeler

New Member
Oct 30, 2017
12
0
1
22
Posting here today to hopefully figure out dafuq is going on with my mustang. 94' 5.0HO.

List of new parts & adjustments.
- Plugs (.054)
- Coil
- Distributor (Adjusted timing to correct degree.)
- Wires
- Radiator & hoses
- Thermostat & Gasket
- Fuel Filter
- Bypassed Smog Pump

Car runs great 90% of the time. Sometimes, when coming to a stop, the idle will lower and raise like it's stumbling. If the motor gets stressed at all, it'll stall itself, or be close to it. The only thing I have left to replace is the fuel sending unit. (bad o ring.) Any help at all would be greatly appreciated.

1994 Mustang GT
5.0HO
T5
Stock headers, offroad x pipe, with two flowmasters that are dumped.
BBK CAI
Can't think of everything off the bat. Thank you for the help though.
 
  • Sponsors(?)


General karthief

wonder how much it would cost to ship you a pair
Mod Dude
Aug 25, 2016
17,190
5,499
193
polk county florida
Check fuel pressure, check for codes.
For idle/stall help our resident tool (jrichker) here has developed (he may have had help from others, not sure) a surging idle checklist, it can be found here:
http://forums.stangnet.com/showthread.php?t=698148
Read it through then roll up your sleeves and start at the top and work your way through, don't skip around, it will help you find and fix things without wasting time and money.
In the tech forum you will find a technical/how to section that has lots of stuff of interest for swapping and modifying our cars.
Welcome to stangnet.
 

jrichker

StangNet's favorite TOOL
SN Certified Technician
Mar 10, 2000
27,243
2,594
234
74
Dublin GA
lowendmac.com
You guys with idle/stall problems could save a lot of time chasing your tails if you would go through the Surging Idle Checklist. Over 50 different people contributed information to it. The first two posts have all the fixes, and steps through the how to find and fix your idle problems without spending a lot of time and money. It includes how to dump the computer codes quickly and simply as one of the first steps. I continue to update it as more people post fixes or ask questions. You can post questions to that sticky and have your name and idle problem recognized. The guys with original problems and fixes get their posts added to the main fix. :D

It's free, I don't get anything for the use of it except knowing I helped a fellow Mustang enthusiast with his car. At last check, it had more than 250,000 hits, which indicates it does help fix idle problems quickly and inexpensively.
 
Thread starter Similar threads Forum Replies Date
T 1994 Mustang GT Floor Pan Replacement 1996 - 2004 SN95 Mustang -General/Talk- 1
G Code 172 Mustang 1994. Can it be the egr ? 1994 - 1995 Specific Tech 2
M 1994 - 1998 SN95 Mustang Paint/Color Guide - Production #'s too! 1996 - 2004 SN95 Mustang -General/Talk- 0
B 1994 mustang cooling fan wiring? PLEASE HELP!! 1994 - 1995 Specific Tech 0
D 1994 Mustang Gt erratic idle 1994 - 1995 Specific Tech 1
M 1994 Mustang COBRA - speedometer not working 1994 - 1995 Specific Tech 12
G 1994 GT Mustang The Welcome Wagon 1
G 1994 GT Mustang The Welcome Wagon 3
beyondEOD SN95 94-95 Microsquirt Pinouts Digital Self-tuning Forum 8
beyondEOD 94-95 Mustang 5.0 AODE MS3 Gold Box w/ Microsquirt Digital Self-tuning Forum 62
T 1995 Explorer intake on 1994 Mustang GT 1994 - 1995 Specific Tech 4
N Please Help I'm Having Trouble with my 1994 Mustang GT 5.0 1994 - 1995 Specific Tech 6
T 1994 mustang gt misfire 1994 - 1995 Specific Tech 16
T Engine 1994 mustang gt Rough idle, misfire under acceleration 1994 - 1995 Specific Tech 2
9 For Sale 1994 cobra coupe, 150k mi, 5spd, 5.0L, $5k obo, Ewing, NJ SN95 Mustangs For Sale (1994-04) 0
N Electrical 94 Mustang Wiring to fuel pump and cooling fan 1994 - 1995 Specific Tech 0
wolfheads Fuse keeps blowing 1994 Mustang GT 1994 - 1995 Specific Tech 3
wolfheads 1994 Mustang gt convertible fuse box 1996 - 2004 SN95 Mustang -General/Talk- 0
N SN95 Need wiring diagram for 3.8l 1994 Mustang GT Please! 1979 - 1995 (Fox, SN95.0, & 2.3L) -General/Talk- 9
R 1994 mustang ecm running rich 1994 - 1995 Specific Tech 21
K 1994 Ranger 2.3l into a 1993 Mustang LX 2.3l? 1979 - 1995 (Fox, SN95.0, & 2.3L) -General/Talk- 4
J For Sale 1994 Mustang GT Autocross/HPDE setup, very clean, California. SN95 Mustangs For Sale (1994-04) 1
W 1994 mustang gt convertable 1979 - 1995 (Fox, SN95.0, & 2.3L) -General/Talk- 2
W 1994 Mustang 5.0 running pig rich, black smoke at idle. 50 miles a tank of fuel 1994 - 1995 Specific Tech 4
M 1994 Ford Mustang GT 5.0 idle issues Fox 5.0 Mustang Tech 1
M 1994 Ford Mustang GT 5.0L The Welcome Wagon 9
N Mating a 1994 Mustang 5.0L to a 1988 2.3L body harness, HELP! Fox 5.0 Mustang Tech 5
D Engine 1994 Mustang GT 5.0 popping 1994 - 1995 Specific Tech 2
no_fox_given For Sale 1994 GT 5L Trickflow h/c/i Tremec TR3550 Saleen copy - $7000 (Ann Arbor, MI) SN95 Mustangs For Sale (1994-04) 3
I 1994 Mustang Gt Mach 460 1994 - 1995 Specific Tech 2
J My 1st Mustang. 1994 GT, 5 Speed The Welcome Wagon 0
D 1994 Mustang Convertible top cables 1979 - 1995 (Fox, SN95.0, & 2.3L) -General/Talk- 1
P 1994 Mustang GT Convertible - Side Exhaust 1979 - 1995 (Fox, SN95.0, & 2.3L) -General/Talk- 1
M 1994 Mustang gt. cranks and tries to start 1994 - 1995 Specific Tech 2
B Engine 1994 Ford Mustang Gt 5.0 No crank, no start 1994 - 1995 Specific Tech 3
J Non Mustang question.. Which 1994 - 1997 F-150 Truck did the 351 W Come in? like which trim? 1996 - 2004 SN95 Mustang -General/Talk- 3
wolfheads 1994 mustang gt speedometer not working 1994 - 1995 Specific Tech 5
G 1994 Mustang Air Bag Flashing Code 12 1994 - 1995 Specific Tech 3
94chirps Exhaust for 1994 Mustang GT 1979 - 1995 (Fox, SN95.0, & 2.3L) -General/Talk- 1
N 1994 Mustang 5.0 - rpms drop when pressing gas while stopped. 1994 - 1995 Specific Tech 11
W 1994 Steeda Mustang GT woes and pains! in need of help! 1994 - 1995 Specific Tech 7
S HELP! Tried Everything. Mustang Cobra 1994 Cranks but won't start... Fox 5.0 Mustang Tech 12
M 1994 3.8L Mustang Dies intermittently 1994 - 1995 Specific Tech 7
Yumagoat Engine 1994 Mustang 3.9 144k miles SN95 V6 Mustang Tech 4
Justin Fetalvero Progress Thread 1994 Free Mustang Budget Build - Project Maui Cruiser 1979 - 1995 (Fox, SN95.0, & 2.3L) -General/Talk- 3
Justin Fetalvero Just Got A Free 1994 Mustang V6! The Welcome Wagon 3
Chythar Expired Cervinis 1994-1998 Mustang Fiberglass Stalker Front Bumper, Painted Dark Forest Green (dfg) Interior Exterior Parts 0
Chythar SOLD 1994-1998 Ford Mustang GT Seats, Front and Rear, Black Fabric Interior Exterior Parts 4
C Mustang 2003-04 Oem Subframe Connectors 1996 - 2004 SN95 Mustang -General/Talk- 3
T 1994 Mustang 5.0 Explorer Intake Swap 1994 - 1995 Specific Tech 8
Similar threads