i put a 96 ho 4.0 in my 88 mj. had a 4.0 to begin with but was 2wd so i swapped it. won't run, have fuel and i believe the timing is set right. ive checked it and it seems ok. can't get it to fire, it turns over but just won't fire. i have the 88 flywheel and cps. do i need a 88 tps?