If I have the wrong ecu hooked up to the motor, what are some of the symptoms to let you know? I currently have installed my swap but can only get the motor to rev up to 2500 RPM's. Now I have already replaced the MAFS and the car still runs like crap and almost like it only runs on 2 cylinders but when you first start it up it runs smooth for a few minutes and there is black smoke puffing out the tail pipe? What is causing all this? Also all the vacuum lines are connected in the correct location.