98 c1500 5.7 vortec kinda Starts and Stalls instantly several times before starting.

[Markus Escamilla]

Twice now, a month apart, my 98 c1500 with the 5.7 vortec has tried to start and stalls instantly. After several tries it finally started and sounded fine with no lack in power or throttle response. I figured it wasnt the starter because it kept cranking for a few seconds and i heard no clicking noises. I have replaced the fuel pump, fuel filter, air filter, and the tps within the last year. My transmission is not slipping but i do hear a rattling when i have my foot on the brake and i put the truck into drive or reverse. Someone told me my torque coverter was going out and that this is why my truck has started to do this. Any advice on what i should do?

[Brian Lindsey]

do a fuel pressure test , sounds like aftermarket fuel pump losing prime occasionally, you need to put oem fuel pumps in

[Markus Escamilla]

I did replace the fuel pump with one from 1aauto so i guess i may be paying for that now

[Markus Escamilla]

5 minutes ago, Markus Escamilla said:

I did replace the fuel pump with one from 1aauto so i guess i may be paying for that now...if the fuel pressure is decent could it be a dirty iac and/or throttle body

[CamGTP]

Yeah you can test the fuel pump priming pressure and see how long it holds it. If it pumps up to lets just say for example 50psi but drops straight away that is a problem. Be it the pump or the regulator not holding pressure.

 

And yes, a dirty throttle body and IAC could cause a start stall on occasion.