2001 Jeep Grand Cherokee jerking

2001 JEEP GRAND CHEROKEE
175,000 MILES • 4.7L • V8 • 4WD • AUTOMATIC
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PSJ011777
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  • 34 POSTS
driving down the road at any speed the car shakes like the transmission is slipping, but the rpm never change. I have one engine code for a misfiring #8, i have replaced the plugs but not the COPS.
Nov 30, 2014 at 12:10 PM
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JOHNNYT73
  • CERTIFIED EXPERT
  • 924 POSTS
If you have a misfire then you need to fix that problem. It could be the coil. It could also be a fallen rocker arm (not a surprise on this motor).
Nov 30, 2014 at 2:31 PM
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PSJ011777
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  • 34 POSTS
Update, once it warms up to operating temp, and you drive it, it feels like the rear axle jerks, the rpms don’t go up or down so I know the transmissions not slipping, fluids good in both front and rear diff's, engine code says nothing about it except running lean on cylinder 2 and 6, which i think means I need to get a new fuel filter,I dont think its ever been replaced, it's got new plugs, the gas lines have been cleaned out, it's got 2 new coil packs. Brakes are fine, transmission fluid is clean and filled. Have no idea, I thought maybe the TPS but it only does it once the car is warmed up and ran for a while, and it does it over 30 mph, not less. Something else, I was living in Boise where elevation is around 2,730 ft above sea level, now i am living in Idaho Falls where the elevation is 4,700 ft above sea level.
Jan 15, 2015 at 11:19 PM
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