I have an 87 GTA with 350 TPI and AT. Recently it will intermittently fast idle at 1500 or so especially when hot. After shut off it is hard starting also. Most of the sensors have been replaced including the coolant temperature sensor and it has a Moats chip which duplicates the 89 Corvette chip, 6E I believe. I had the ECM and chip checked out by TPI sales and service, no glitches found. Anyone have a similiar issue or solution?
Thanks,
Laser