p0300

So my 07 2 door jk 3.8.....it started with a p0301 misfire in cylinder 1, so I changed cylinder 1 spark plug. then it through p0303 misfire in cylinder 3, so I changed all of the spark plugs and the plug wires. then it through just a p0300 misfire in random cylinders. the Jeep runs fine, no...

2001 Jeep Grand Cheerokee Laredo Codes: P1391, P0300, P0301, P0302, P0303, P0304, P0305, P0340, P0320 Runs rough in idle when in drive or park. Runs ok when driving or neutral. Has shut off once in idle. In idle rpms drop down to 500. I don't know where to start. Have had codes P1391, P0300 and...