So here is my follow up then. The issue with the car is that while driving (after making a few stops) the car will start to sputter and not want to shift gears. If you pull over and turn it off, give it a minute and then restart it will continue driving fine usually until you have made many stops again. The mechanic said the brain just wasn't responding. Do you believe if we took it out and cleaned it that the problem could be corrected? Also, if we found another ECM from a 2002 grand prix, can they be interchanged? Would the new ECM have to be programmed at a dealership?
