Hello,
I have a 1998 Jeep Cherokee Sport 4.0L that has a rough idle/misfire. It sometimes struggles to start and it seems to accelerate fine until reaching overdrive. When in overdrive it has a heavy shake and when I apply throttle it gets substantially worse. I have done new plugs, wires, cap, rotor, ignition coil, TPS, IAC valve, Coolant Temp Sensor. I also went through and did a Seafoam treatment through fuel and motor and put some down my cylinders when changing the plugs to see if that would help a little bit. At first it seemed to be better after the tune-up but a few minutes of driving went by and my problem was as prominent as before. Any help would be greatly appreciated. Thanks!