Originally Posted by jeep5.7
when im in park or idling for a little bit,the rpms go up and down about 2-3 hundred rpms and it will do it appr. every 15 seconds or so,but not everyday,its unpredictable,
If you have not already done so, I recommend that you clean the back side of the throttle body and butterfly plate. Good time to install the Billet Technology oil catch can also. http://www.billettechnology.com/#!__page-0_copy1
I cleaned mine at 32K and 56K miles, then installed the oil catch can. Totally fouled with crud both times.
'08 WK Limited, 5.7L HEMI, Quadra-Trac II, Bright Silver Metallic, Class IV Hitch, Michelin LTX M/S tires, Billet Technology oil catch can, Fumoto oil drain valve.