hey all. hows it going? well my car is an 86' IROC, 305 TPI, w/66,000 origional miles on it. when i start it up, it is idling really rough. this only happens every once in awhile...not being consistant. when i ran the diagnostics i got an air code 4-2 stating the EST (electronic spark timing) problem.
i called autozone they said i cant replace just the module, there is a problem w/the computer or a wiring problem.
can anyone give me advice or help. i would really appreciate it. thank you very much.