2001 Jeep Grand Cherokee jerking

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.