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Ok, here's an update. I replaced the TFI module again, I thought perhaps I bought a faulty one. I put the new one in and the code 18 went away until I drove it and came back. I borrowed a friend's computer and drove the car and checked again. No code 18. I beat the crap out of the car too. I'm...

Distributor cap is fine. I don't know how that would throw a code. And the diagram said to test the plug, not the module. So I did. When I bought the part I had them test it on their tester thing they have and it tested good.

Ok, I don't know if there was confusion but when I checked the yellow/lt green wire I got hardly any resistance. But I checked the dark green/yellow to the ground I got 140,000 ohms. Where to next?

Sorry, I wasn't clear. By ignition module I meant the TFI module. Its just what autozone calls it. There was no change. Still the code 18.

I'll try the 100 kohm resistance check. That's the only check that I haven't run yet. Like I said, I've already replaced the TFI module, unless I bought a bad one. I'll give it a shot when it clears up outside. If it doesn't get the 100 kohms what is the problem? I have already checked pin 4 and...

Here goes. I have a 1988 GT Vert with a 331 and a TKO 600. It has Trick Flow Track Heat heads, MSD 6AL, BBK SSI upper and lower intake, X303, 30# injectors, Long tubes, MAF conversion, roller rockers, electric fan, 6AL, 75mm throttle body, BBK CAI and probably a few more things. On the KOEO test...