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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...