Re: check engine light is on, engine runs rough(idle is...
Check or have engine tuned up. Spark plug wires + spark plugs.
Or/and take it to Autozone, and they'll run a
check engine light scan for you, for FREE !!
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if it runs rough only at idle with the AC on then it osunds like a the idle solenoid that causes the vehicle to idle up when the ac is on. if its during the entire RPM range then you might want to check your alternator or battery, perhaps one of them isn't supplying enough power to run the engine, lights and A/C
Yes bad plugs/ worn plugs /oiled up plugs/ or HTleads with spark jumping will all cause the engine to run rough,and not idle and when it does it runs rough enough to break the engine mounts.
When its dark at night start the engine and look under the bonnet do you see sparks jumping if yes replace the worn parts if no then check plugs and if light grey there ok /if black through away.
So check it out and let me know how you get on . Ron
hello first check your idle with the car running foot on brake see were your rpm reading is if your below 500rpm check your label underhood for your curb idle setting second see if theres a adjustment screw you can increase were your gas cable lever rest against your set screw underhood if you feel confident enough remove your iac motor idle air control valve if the bore were the end of the pintle extracts out to close has varnish builup our carbon it will stick creating vacuum leak type senario causing stalling rough idle sometimes even no start conditions good luck
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