I have a 1989 chevy truck with a 350 TBI that won't start. It turns over fine and you hear the fuel pump hum, but it won't start. If you dump a small amount of gas in the TBI housing it will start and run fine. The minute you turn the ignition switch off and try to restart it it will not start. The truck has 150K miles on it and it has been well maintained. The problem started a few times here and there and now does it all the time. I have installed a fuel pump and strainer, I rebuilt the TBI and installed a new AIC. I have checked all the fuses and think it is something to do with the injector signal at start up, but I can not find anything on it in my crappy haynes repair manual. Any help would be great.