have replaced the cap rotor plugs wires and egr
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1993 Chevrolet S10 Question: what will cause an eratic idle and throw a light
Answer #1raiderron March 21, 2011, 23:36Master
Would help if you supplied the code attached to the light. Have a parts store attach scanner and hit us back with code.
Answer #21993 March 07, 2013, 15:53Rookie
More than likly you have a vacuum leak. The way to locate where would be to get a can of carbuerator cleaner and with the engine running spray around the throttle body and vacuum line and listen for a change in idle.