[tharris6801]

I need a little direction, My 1990 Mustang GT, at low speeds misfires freaquently, cruzing down the Hiway at a steady speed it is fine. Now at wide open throttle it missfires even worse than low speeds. With the car in park, I can not get the motor to missfire at all? I have put a complete tune up on the car.

[primer gt]

thats the same problem that i am having i did a full tune up and the same thing it still happens but only when theh car is at full temp my guess is my alt is not keeping up to my electric fan that i installed

[maggard25]

my car was doing the same thing i changed ever thing on mine but the computer and i changed the computer and its fine now so you all may want to try that

[93stangfutr5.0]

also sounds like it maybe your crank sensor.

[EagleAutosports]

You might need to have the distributor checked to make sure the pickup is working fine or is on the way out. Or maybe even the module.

[tharris6801]

Thanks for the distributer tip, changed it out, and solved problem.

[EagleAutosports]

What was it, the pickup inside the distributor?

[tharris6801]

Not sure, I had a stock distributer from one of my early 5.0 projects. It was new from ford, so I just stabbed it , set the timing at 16 degrees. Got in the car, smashed the gas.