I have a 90 ef with a 90 ls motor in it. I put in a full msd igintion and it was all working out real nice until one day when i was using the 2 step my car back fired a few times then the rpm's wouldn't go past 3000 rpms then when i tried moving the car, when i put it in gear it wouldn't go past 2000 rpms so i had my car towed and i have already tried changing my distributor, my spark plugs, i tried with the msd unhooked and i still can't figure it out i checked my grounds and everything and can't get to the bottom of it. I also checked the preasure in each cylinder and they all were right around 190 psi so please help if u have an ideas im running out of them. oh and i also tried changing the computer to make sure that wasn't messing it all up. so let me know

 

Are there any codes on the ecu? Did you try it without the MSD and another computer at the same time?

 

yeah i tried that to im not sure wtf it could be im about to make sure my timing is fine but i tried that last time so if anyone can help plz do