1994 Ford Mustang GT. No Codes. Starts and Runs fine, until the Temperature gauge gets to about 170 degrees or so. Then it runs terrible. It bucks and the idle surges. The plugs become black if I drive it long in this stage. Turning the ignition off and immediately back on sometimes fixes it for a moment, but it resumes soon afterwards. In the mornings, when it is colder outside, I can sometimes drive for 20 minutes before the problem occurs. I have changed ACT and ECT and o2 sensors. I have tried a different MAF as well. None of these have any effect
Optional Information: 1994 Ford coupe 5.0
Already Tried:
ACT, ECT, 02 sensors
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