Idle Fluctuation Problems
I'm trying to solve an idle problem. Engine idles fine at 800 rpm when the engine is cold. However, when the engine is hot (operating temp, 200 degrees), idle will fluctuate from 800 to 500 rpm, back to 800 rpm. When this happens, sometimes the rpm will drop low enough to stall the car. This will continue for about a minute and then the idle will stabilize to 800 rpm. Then a few minutes later, it will start to fluctuate again. I just changed the TFI module thinking this would help but no luck. Anyone have any other suggestions?
1988 Ford Mustang GT, FRPP Mass Air Conversion, 24lb injectors, Kirban AFPR, 73mm C&L MAF, Rebuilt 5.0 w/8k so far, Edelbrock Performer 5.0 Heads, Ported Typhoon Intake, Crane 1.7 Roller Rockers, Underdrive Pulleys, MAC Shorty Headers, MAC Hi-Flow Cats, 2 1/2" Spintech Pro Streets, T5z, Pro 5.0 Shifter, FRPP 3.73's, H&R Super Sport Springs, KYB Front Struts/Rear Shocks, SSM Upper Control Arms, Custom gauge cluster, all Autometer gauges