I'm new to this site and really hope I can find out how to fix this. I have a 1998 Jeep Wrangler Sport that me and my son have basically rebuilt (still in the process) anyway we finnally got it to start but when it does start the RPM's go to redline very quickly. We have recently replaced the computer with a remanufactured one (yes it was pre-programmed or flashed) also the fuel control senser, the idle speed control motor, the crankshaft position sensor along with a host of other parts. If anyone has ANY ideas they would be greatly welcomed. Oh the motor is a 4.0L with the MPI system.