Ok This is in my friends 92 sentra SE-R we but a red top SR motor in it and it has a really wild idle ( sounds like a monster cam on a V8) And it only runs at full throttle , If you try and go constant speed the car will buck back and forth . If you let it idle it will die , The only thing that didnt work with the motor is The ACC I have no clue what this is , But we used the one from his original SR20DE motor , Im thinking that that may be the problem > Any advive would be wonderfull

 

are you posistive this is a good motor?

sounds like it could be your ignition....... check plugs, coil packs, igniter

What is an ACC ?

 

acc= automatic climate control?
im guessin here