This one's got me stumped. Every once in awhile my 87 Jimmy (TBI) won't start when the engine is cold. It cranks fine. Once I looked in the air cleaner and was pretty sure no fuel was being sprayed by the injectors. However, I ran around to the back and heard the fuel pump working. The fuel filter is fairly new. If I leave it sit for awhile and come back it'll start. Once running it seems to have no power loss and idles fine. What could it be??? My first thought is a flakey pump. My gauge does bounce and I've heard that a sender going is usually a sign of a pump going. Second, faulty injectors. I haven't had the chance to test the electrical pulses to the injectors since it always seems to happen at inoportune times. Finally, this problem seems to coincide with the time when my rear u-joints exploded. All it takes is a look around but maybe a cap shot off and damaged my fuel line. Wouldn't that affect performance though?? Please help!!