How to determine the code when Check Engine light is on and idles rough
My 2004 Jeep Grand Cherokee will suddenly start running rough at idle and is
now starting to misfire under acceleration.
Plug in a scan tool set for Jeep specific, read the codes, then diagnosis each code as listed by using the diagnostic chart listed in the repair manual. You should do overlook of the engine, make sure nothing has been disconnected, damaged, and all fluid levels are normal. Maybe even give it a tune up.
Have the car scanned at auto zone for free....
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