my jeep is slowly loosing power, when u hit the gas it kinda sounds like your trying to start in to hight of gear, and sime timed going from say 3rd to 4th, when i shift it feels like i shouldnt of shifted power wise but rpm wise i needed to shift. its like a studder. then today i stopped at a stop sign and when i hit the gas my engine was struggling not to stall and wouldnt go past 2k rpm in nutral. i had to shut it off and restart. any ideas?