[Out To Lunch]

Hi all

My 90 silverado 5.7L 4x4 was running fine until we took a trip up to PA. On the way back we stopped to get some gas and the truck didn't want to start. It would turn over but just wouldn't start up. I checked what I could at the time (air filter, plugs, etc) and after a while it finally just started. So we were back on our way home but had to stop at a rest area a little while later cuz nature was calling. I didn't want the same thing to happen, so we left the truck running. The truck ended up stalling. It finally started again (it always turns over) and we almost got out of the rest area except it stalled once more when I let my foot off the gas pedal for a moment. Long story short - drove the rest of the 300 miles home with my foot never leaving the gas pedal (an interesting and stressful trip). We got about 2 miles from home and the truck stalled and would not start again (i don't think I let my foot off the pedal, but I might have). A neighbor towed it back to our house and now it won't start at all.

I know the fuel pump is working because i can hear it running for a few seconds when the ignition key is turned. I figured I would start with the cheapest part replacement and work from there - so I replaced the fuel filter with no improvement.

I think it has something to do with the fuel system (the truck has Throttle Body Injection) - so I started there. Please note that I do not have any fuel pressure diagnostic tools. Of course, I am attempting to fix this with the least expense possible. What would you suggest is the cause of the problem?

Thanks!