Only happens when the weather starts to turn cold. I start it up and it shakes, makes a knocking sound the rpms shoot up and the engine try's to resolve the issue, but it dies. I have to restart and it continues with the problem, but i am gassing it so it doesn't die again and do it about 30 seconds. Once warm, as i'm driving, the lights on the console flicker and rpms go up and down at a stop. Takes driving for about 10 minutes for it to resolve itself. Oh and the real bitch was we were on our way to the races about 200 miles from home and suddenly the truck started to slow down even though i was still applying the gas...it was if it wasn't getting gas so we coasted to a stop and it died. It would not start again after trying several times, until my husband started knocking on top black portion of the engine, closest to windshield. Then to our elation it started up and ran normally all the way there and back. And amazingly it hasn't happened again.

This fricken thing is driving me crazy and no one can tell me what is wrong with it. I have taken it to 3 places and paid well over 500.00 in diagnostic charges for them to tell me, "well everything checks out and we can not find the cause". OMG!!! This is my first american made vehicle and as much as i hate to say it, I will never buy another!!! We american's can't even figure out what the hell is wrong with our own american made vehicles...WTF?

I have a 2001 Chevy Suburban with a 5.3L V8 at with propane conversion. I pulled in my drive way and got out and left it running. I went inside my house and came back out two minutes later it had died. I tried to start it but it just cranked over. I had a friend who is a mechanic take a look at it and he said it was the fuel pump. I had him replace it and now it still won't start. He dropped the fuel tank back down and unplugged the wiring harness to it and checked the voltage and it was not getting any power to the pump. The fuel gauge however was getting power. I have not found the problem yet.