Ok I'm new to forums but I thought I would give this a try. I have a 2000 Cherokee that it's throwing p1391 crankshaft position sensor code it did this about six months ago and I replaced the the crankshaft position sensor and the camshaft sensor and I think the throttle position sensor I can't remember for sure which one of those parts fixed the problem but the problem is now back I replace the crankshaft position sensor two more times and the problem has not gone away and yes the crankshaft position sensor is an after-market one from Napa... Any ideas of what else could be the problem when you first start it up and idles extremely rough the RPM's search and after driving over an hour the other day it died and wouldn't restart until cool down for about 20 minutes

 

Wiring and/or connectors.