Just recently purchased a Jeep Comanche. Having trouble keeping it running. Previous owner stated that he would have to feather the throttle when standing still to keep it running. It is a 2.5L I-4 engine, with a 4spd 4wd transmission. Purchased it as a mud toy, but getting ready to buy an engagement ring and want a little more money than I have. Just trying to get it running to increase the sale value. Any ideas?