Hi, Vickie; Did you re-use all of the sensors from the old engine? If not, could be a compatibility issue with the computer? Recheck all of the connections. Jeep crank sensors are a common problem. Did you use the original flywheel? That is where the crank sensor gets it signal.
Just replaced engine 93 Jeep Wrangler old motor slum rod now can’t get fire to coil Or fuel pump