N Nicholas New member May 18, 2010 #1 I have a 2000 Jeep Grand Cherokee Laredo 4.7 liter engine and at idle the engine revs up and down by itself... a few months ago i replaced the stock muffler with a flowmaster 50 series what could it be
I have a 2000 Jeep Grand Cherokee Laredo 4.7 liter engine and at idle the engine revs up and down by itself... a few months ago i replaced the stock muffler with a flowmaster 50 series what could it be
