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Okay so I'm back to close out this thread with the final update. Turns out it was a culmination of multiple issues, and they've all been addressed. The fuel pump wiring was only part of the problem. As it turns out, the lower intake gaskets weren't doing their job. Coolant was migrating into the...

Well... Before I respond to the last couple posts (cause I think you guys are dead on with part of the problem), let me update with what happened tonight. Since recently it's been running pretty well, I drove it a couple hours to Palm Beach International Raceway, to get a baseline 1/4 mile MPH...

I really wish it were a vacuum leak. I've sprayed everything from carb cleaner to straight ether all over the engine bay, and the idle wont change. All the vacuum lines are new rubberized tubing. The only place I could possibly see there being a vacuum leak would be somewhere in the lower intake...

It better not be spun. It's a brand new SFI Approved 50oz unit from Romac (DSS Racing). I've tried multiple working MAF's, and even ran it without the MAF to troubleshoot. It had the same exact popping each time. Pro-M told me it sounded ignition based too, but after going through the whole...

Grabbin Asphalt: Yep, tried all those. The fuel pressure is steady when's it's popping like that. I've tried it with vacuum on and off too, with the same results. Mikestang63: GAW as in Gabby's Auto Works? Wow I didn't know they were still around! That was a popular place for Mustang guys...

Distributor didnt do it either... Guess it's time to focus on the fuel system. I have an A9P computer that I'm going to try as well just in case. I replaced my original A9L when it fried with an 8LD, and i just want to be sure its not hiccupping. What sucks is that this may boil down to a...

That's right, $#!+ just got real... I'm no longer installing and replacing parts, I'm stabbing and throwing them lol.

Spoke too soon... Still no dice. I'll try stabbing my spare Motorcraft distributor in tonight and see where that gets me.

Woah I didn't realize I had so many responses since last week. I stopped getting email notifications. Here's the update: I replaced the TFI module, and as suspected nothing changed. I finally got around to taking the Crane Cams Fireball coil off tonight, and temporarily replaced it with an MSD...

I do plan on putting one back on for diagnostic purposes, but just out of curiosity why? I had this coil on my previous motor and it worked brilliantly for years. Thanks, and happy Thanksgiving!

Stock ignition system, except for a Crane Fireball coil. Like I said, I'm not putting the MSD ignition box or coil on until these issues are sorted. I'm certain the wires aren't arcing. I have done the spray mist test just to be sure though. The issue that Ford Racing wires are known for is...

So I spent last night troubleshooting the MAF, and contacted a rep at Pro-M Racing this morning to see what their thoughts were. Turns out it's not the MAF. According to even the Pro-M rep, it's an ignition problem. I ran diagnostics with them on the phone, and they confirmed the readings I was...

Well, no dice. Still popping. I even waited for new Motorcraft sensors, but the popping is still there exactly as before. Maybe I can find a ProM meter on sale for cyber Monday.

Definitely a good battery. I never store my testing equipment with batteries in it, so I had to put a new one in just for this test. Sounds like you're right about them about to fall off. I performed the Ohms test on the harness and it's right around 0.5. The engine grounds are all good, and...

jrichker: Thanks for posting the o2 sensor testing procedures. I've those bookmarked for awhile now, but it was a good reminder. On that note, I decided to break out my analog meter and retest the o2 sensors... They are both now only switching between 0.01 V min, and 0.03 V max at idle. Last...

Gearbanger101: Definitely let me know if the new Motorcraft (still made by Bosch?) o2 sensors help you out. I have a pair of Motorcraft o2's on mine now, but they aren't new. They were known working units from my dads 93 Cobra with about 10,000 miles on them. They did sit on the shelf for about...

It falls on its face even in the stock bank though, meaning the computer all by itself with no tune. Granted, it runs like crap on the stock tune since the EGR values are missing, but that doesn't explain the pop/miss at idle and part throttle. I'm 100% sure that this issue is not due to the SCT...

Reduced the base timing to 10 degrees from 12, and it actually got worse. Now it stumbles flat on its face. I tried going the other way, and everything seemed to smooth out around 18 degrees initial. The popping smoothed out the higher up I went, which makes no sense to me. I noticed that as...

Agreed on the free troubleshooting steps. Always better than throwing parts at it. I haven't tried backing the timing down below 12 degrees, so I'll try it out tomorrow and report back. I'll also check to see when full advance comes in while I'm at it to try ruling out any distributor issues...

I don't think so, but it would be really hard to hear it over the lope of the cam if it did. The final lift (at the valve) on the cam is 513 intake, and 529 exhaust to give you an idea. Idle is set at 750 rpm and it maintains it pretty steadily. When you give it partial throttle, as soon as the...