We have a company here that tells me their ecm will run the engine, no problem. Pricy but no problem. The reason I want to go with the stock GM ecm is the car will be my wifes daily summer driver and I want reliability above all. I do not want to take the car on the road and have a computer problem I can't fix and neither can anyone else that dosen't have a laptop with whatever program is needed to check out the aftermarket ecm. Have you looked carefully at the 4.2? What do you plan to put it in?
