sounds like a wiring issue, get a pro out to look at it if you have no clue, also it shouldnt be a fuel pump issue etc because you were running the same one prior to the new motor right ?. try and see if your fuel lines are in the right way (in + out) try diagnose the problem first, when you crank it open the in fuel line see if its getting fuel, if thats the case thats not the issue, then check your spark, and so on. :) is it the same ecu ? or ?