Question about Metra Ford/Chry/Jeep 1974 99

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Rough idel I have a 99 with a 4.0 that has a rough idel and the service engine light is on it smooths out just off idel and runs fine at higher rpms and under a load.

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If your check engine light is on, you can have the OBDII code read at most local autoparts stores. If you have a flashing check engine light, don't continue to drive as you will damage your catalytic converter. The auto parts store can tell you what the P-code is and what the possible parts replacement solution would be. Call ahead to make sure they offer this as a free service. If it is at idle, my hunch is you need to clean your throttle plate and throttle bores. You didn't say what kind of car or engine (Just 99 4.0L). So that's as specific as I can be.

Posted on Feb 28, 2009

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Plugged air filter - replace.

Dirty throttle body and idle/air control motor - Can of Carb. cleaner sprayed into throttle body and idle/air hole while engine is running.

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