Ok all, have a problem, and about at the end of my wits. We have a '99 TJ with the 4.0L that we recently pulled the engine out to do a complete rebuild. Engine had a blown head gasket, so we figured we would just go ahead and go thru and do a rebuild. Everything went fine, all back together, but the darn thing will not start. Here are the details so far... First we are absolutely sure mechanically the timing of crank and cam is good. It is getting 50 psi to the fuel rail when cranking. Coil is new, spark plugs fire when cranked. Crankshaft position sensor is brand new (already thought that may be the issue). The engine turns over and over but will not crank, sometimes it sorta stumbles a little bit, almost like it's trying to start, but not a thing. Leads me to believe it's a timing issue, but these things are completely computer controlled, so what gives? any ideas would be greatly appreciated. Thanks!