I have a 91 Camaro w/ a 305 TBI. I had a GM Fastchip in there for a long time, but just purchased a nitrous kit, so i went back to my stock chip. With the stock chip in the car's Service Engine Soon light flickers and when scanned the cannot be read. When I put the fastchip back in everything's fine. What's the deal???

 

Look for a bent pin on the stocker, or it probably got zapped by static electricity.