Ok so I have a 98 SE which had its 2.7 replaced with 3.2 a month ago. Both engine and computer is from a 2000. But since I've bought the car its had this rough start up problem. Sometimes the car doesnt wanna start up after its been warmed up and shut off. The car runs like a dream all belts are new, egr replaced, rad fans replaced, new fuel pump and brakes...but its had this same problem for a long time now and Im about ready to post it up for sale. If you warm the car up and shut it off and turn it on it fires right up. If you give it and hour its also fine, but if its just 10-20 minutes it either has a really rough startup/idle or it doesnt start up at all. Im hoping I can resolve this issue or the trep has gotta go.