I have a '89 f-150 that keeps giving me a different code each time I check the computer. I have on injector that is tuck open and no spark. The injectors are supposed to be linked in groups but only one is stuck open and has been replaced with a new one with the same results.

Any Clues?

 

Try disconnecting the positive post on battery for 20 mins. then reconnect. Resets the computor.