hi ok so here we go, i have a 2000 gt mustang i picked up off a kid that ran perfect excepte for the fact that it stoped oiling to the passenger head, i pull out the motor and dropped in a new 04 gt romeo motor with 30,000 on it and it was clean!!! after getting it in and using the old wiriing harness, i fired it up and it ran like ****! i checked and numbers 3,4, and 8 were not hitting. so i replaced all the plugs and three coil packs now its missing on the same plus 7!?!?!? the front 4 are hitting but the back 4 are not. the only thing i did different was the car had two o2 like plugs for the back two sensors and i didnt put them back on just left them un plugged. i checked all the coils and there good, i'm pretty sure i checked the alternator right and its charging so plus i hooked up the battery charger and put it on jump mode to make sure it was getting enough fire so its not that. some of the plugs were wet when i pulled them back out so im pretty sure its not the injectors. i ran a compression and all of them are at 110ish. im lost, i dont know what to do next? the computer? cam position sensor maybe? idk. the intake and injectors are off of the widnsor engine so i know they worked. the wiring is to so i dont know what is wrong. do i need to use the romeo wiring harness i have? will it even work? please any and all help would be appreciated, i'm just at the breaking point on this car and out of ideas.