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My 94 C4 idle is 2000 rpm. I replaced the IAC & tried resetting the idle. But it still 1800 rpm. Any suggestions? How about good instructions on how to reset Idle?
Here's another idea, take off the air inlet snorkel near the throttle body .
Put a little gas in a oil or squirt can and while its on a fast idle, squirter some gas in the throttle body . If the engine speeds up , you have a lean condition . If the additional gas makes the engine slow down , your air fuel ratio is good and fuel is sneaking in somewhere
Also make sure the throttle plate is closed by visual observation