Ok so i put a used motor in my ls i dont know what year it what out of all i know is that the distributor was different and plug to the alternator are different i spliced in the plug for the alternator and it worked find the distributor though i took off my old motor it had 2 plugs and the newer one had on plug i used my old distributor could this be a problem my fuel pump also isnt running when key on anymore so no spark and no fuel need to get this car running asap has anyone come across this and can help???? thanks alot

 

ECU probably