2003 Saturn LW300 ECM
Changed the motor in my car. I put my original ECM on the new motor due to
the one that was on it wouldn't start my car. When I put the ECM on it from my
original motor, she will start and run cold, after heated up and shut off it'll start
but when you push the gas there's a hesitation and the rev takes a few seconds
to increase but will only go half rev......any suggestions. I've checked all
connections, fuel pressure, exhaust, everything except flash the ECM. Is that
what I need to do?