2WD 4 door jeep Cherokee Sport

Runs And drives. It has a rough idle. I don't know what it is. It might be bad gas. it has a half tank of gas that I put in back in August 2016. This Jeep just sits in the drive way. I only drive it once each week when I mow the grass. Its a 1999 but the Aluminum Head was replaced with a cast iron from a 98. Also with that new main bearing and rod bearings installed. also the Jeep needs a new fuel pressure regulator (FPR). The check valve within the FPR has failed. This results in the jeep having extended crank times when it sits for any long period of time. But the Jeep starts every time.It has the Chrysler 8.25 rear end. Which is more stout than the Dana 35 rear which is also found in Jeep Cherokees.