Sorry but I had to bring this one back from the dead, because i'm having the same issue here. I always thought that fuel injector cleaners are fine for all cars. My car was running perfect until I used gumout fuel injector cleaner. Mind you I have a 91 C4.
Now I must quote the poster who said, ""With '85-88 Bosch injectors, do not use cleaning additives in the gas tank. Fuel-system cleaners are not recommended, by GM, because of the kinds of materials used in the fuel tank bladder, fuel O-rings, and fuel line hoses. If cleaning is required, use the GM specified procedure. On the other hand, Multec injectors, in the '89-01 models, do not need cleaning, and doing so could damage them."
This was taken from Ken's post, which was taken from Charles Probst book "Corvette Fuel Injection."
thing is I went crazy with the injector fluid. I used this cheap gumout injector cleaner from autozone it was like $5. That's when I started having starting issues, but I didn't think it would be the injector cleaner, since that was suppose to do good and clean the injectors. But any how, I finished the tank, filled her up again and added injector cleaner again. I started having starting issues...and at this time, it will not start any more. Cranks just won't start...and it's not the battery. So I assume it's most likely my injectors are damaged? Could they be simply cleaned or should they all be replaced?