Just got a 1990 lx notchback. I need help please


New Member
Mar 1, 2020
Tallahassee, FL
I just got a new to me mustang. I want this car to be more a weekend cruiser than a total drag car. It idles around 1k rpm. How do I go about tuning it? A shop?
Is the cam and head setup mild enough to be street driven?

Thanks in advance!

I will attach a mod list below.
Screenshot_20200227-191351 (1).png
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Active Member
Jan 12, 2020
I think that’s a fine engine set up for the street. The throttle body may be a little undersized and some people have issues with c&l maf’s. As long as it runs fine, no need change it. You can use a local tuner, if there is one near you able to tune eec iv. It’s kinda a dying art though. You may need to get a stand-alone like mega/micro squirt, pimp, terminator x, and tune it yourself.


Active Member
Jan 12, 2020
Also, for what it’s worth, I have a custom dyno tune and my car likes to idle around 1,000 rpm as well.


15 Year Member
Nov 29, 1999
Boca Raton, Florida
It's setup for drag racing with the line lok and drag struts. May have to change some suspension for more streetable ride.

Other than that, I basically ran a similar setup. My 94 had a V-1 Vortech, the same GT40X Heads (with upgraded valve springs and valves), Crower Baby Cam, Long Tubes, 2.5" Exhaust all the way back, Edelbrock RPM Intake, 70MM Throttle Body, Pro-M 80MM MAF, same 42 pound injectors. Car made a tad over 480HP at the wheels but it was with an aggressive pulley on the blower (15 pounds). Second day after the tune I was racing a chick in a supercharged grabber blue Mach 1 back in the day....saw 18psi and then white smoke out the back. Blew the driver head off the block. Changed the head gaskets, pulley'd back up to a 3.33" pulley for 8-10 pounds. My car usually made more boost with the tension I was using at the time.

You should be making over 400HP at the wheels. That would be a nice street setup considering the new Mustangs make 450+ these days stock.

Untitled by jpjr50, on Flickr


Active Member
Apr 30, 2017
Love the honest title to the thread. “I need help please” is pretty much the story of my life, at least when it comes to my Mustangs, lol.

Congrats on the new ride. Got any pics?
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CT Material here
Mod Dude
Jul 7, 2005
The combo that you have will run "ok" with the stock A9L computer and C&L MAF.

If you are wanting to tune the car for driveability and maximize combo then you have a couple options:

- Chip for the stock computer
- Standalone ECU

There are multiple options as mentioned above for standalone ECU's. Many of us use Megasquirt and typically recommend a PIMPXS, which will be able to handle your current combo with ease. We also have a resident expert on here if you need help with tuning as well @a91what including a sub-forum support as well https://www.stangnet.com/mustang-forums/forums/digital-self-tuning-forum.357/


Mod Dude
Apr 6, 2011
Hillsborough county
Hello, as for tuning options... the EEC is getting old, its just a matter of time before you have to either replace or repair the old ECU.

I have lots of experience with these cars and many different cams... of course tighter LSA cams will idle a bit rougher but if you cannot achieve less than 1k rpm idle speed after a tune with a mild to moderate cam... you need a better tuner.
No reason the E303 cant idle below or at 850rpm...
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