Recently took a friend to buy his first jeep. He purchased a 2001 wrangler sport with an inline-6 and 100K miles... few days later it began to stall with no warning. The air filter was brand new and recently had oil changed. Took a look and had to replace the fuel pump and assembly as there was very low fuel pressure. Drove it for a while (days) with no issues and then it began stalling again with no warning... ran sea foam through two tanks of gas now and replaced the spark plugs. Everything ran fine... day or so later same thing.
Started looking at other reasons for the stalling... came up with the ACI sensor. ACI sensor was replaced yesterday and ran well... lower RPM at idle and no hesitation when letting off the gas pedal. Drove it to work today and on the way home it stalled again. Now we are thinking the Crankshaft Position sensor... just grasping at straws now!
Just to add a wrinkle to the whole story... there has not been a Check Engine Light on the entire time!