I have a 1989 Jeep Cherokee Sport with the 4.0 with 160000 miles. Just recently I had a fuel injector blow out and I only replaced that one. Everything was good until I filled up at a gas station, then my jeep right after starting off would not accelerate and the RPMs will remain constant while the vehicle slowed down, but if I let off the gas then reapplied it would run just fine, the vehicle still has plenty of power, but now it has started to stumble/buck while moving if I let off the gas slightly. I will post more information as I can