Wde84

First the truck is a 1999, It the body style of the 1998. Second thing is that I drove the truck the day before and I ran fine. I parked the truck and the next
morning it would start and immediately die. No
check engine light or codes with my scanner. I have
replaced fuel filter, fuel pressure is 60psi, replace
cap rotor and plug wires, ignition coil, mas air flow
sensor. There was no change. Where should I go
from here? Crankshaft position sensor, o2 sensors,
throttle position sensor, intake air valve?

mountainmanjoe

Instead of throwing random parts at it, do some troubleshooting to help narrow down the problem. Combustion needs three ingredients.

Did you test the plugs for spark?

Try spraying starter fluid down the intake and see if that makes it run longer.

Little Bear

Sounds like passlock problems. Is your security light flashing with the key in the on position? Try to reset the passlock system by trying to start the truck then when it dies leave the key in the on position for 10 -15 minutes, until the security light quits flashing and is on solid, then start the truck without turning the key to the off position first. It should start and run, if it runs fine then the passlock has been reset and you can shut it off and be good to go.

Wde84

I did not check for sparred I just assumed that I had spark because it would start for just a second before I would die

Rednucleus

Is the 99 throttle body? If so try adding gas to the intake as yo start it. Will that keep it running?

Wde84

I tried to pass lock reset and that did not work the security light was already saw it on the dash but we reset anyways

02chevy4.3

Did you figure out what it is?

triples82

i would like to know if u have found the problem &/or fixed the problem & if so what was it & how did u fix it cause my 02 Silverado 1500 HD is currently doin the same thing & im at a lose & bout to loose my mind.

mountainmanjoe

You both need to read what's posted and try the basic troubleshooting first.