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Q: what will cause an eratic idle and throw a light on 1993 Chevrolet S10

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have replaced the cap rotor plugs wires and egr
(2) Answers
Would help if you supplied the code attached to the light. Have a parts store attach scanner and hit us back with code.
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.