i just purchased a 2003 avalanche and the previous owner installed a diablo sport programmer but didnt like running premium gas so set it back 2 stock, i attempted to install it back and it came up to the point where it said 100 percent complete and said error, now the truck will not start or do n e ...

i just purchased a 200 avalanche and the previous owner installed a diablo sport programmer but didnt like running premium gas so set it back 2 stock, i attempted to install it back and it came up to the point where it said 100 percent complete and said error, now the truck will not start or do n e ...