every time im on my way back from camping/wheeling or something of the sort my jeep bucks it feels like the rearend jerks pulls backwards?? idk what this is any help? it hardly ever does it around town and its when im goin around 50-60mph. thanks

 

Manual, auto, i6, i4? Is it changing gears when it bucks? Little more info needed please...

 

inline 6 , auto, stock gears staying in same gear overdrive.

 

Sounds like it may be vapor locking at that rpm. But if it's only doing it at that mph it sounds like that trans isn't down shifting like it should. How many miles are on it?

 

Put it on a code reader. Save a headache! Sounds like fuel delivery is cutting out. Could be o2's, fuel pump/filter issue, or poss a computer like TPS, IAC valve, maybe ECM... Like I said, find a good garage with a good diagnostic computer.

 

its got 123,000 on it.

 

i have already replaced th tps my friend touched it and it just broke apart.