Need to know what year the car is Squiggy, are you sure the ecm you got is good? Kinda hard to not get it pluged in right, but worth taking it back out and reinstalling it, is the ecm from the same year car? Only two years were interchangable the '96 and '97s If you got it from the junk yard I would go back and swap for another one, might grab a P71 ecm (police computer) slightly firmer shifts, raised fuel limiter, raised shift points, much higher speed limiter.