I have a 2003 silverado with a 4.8L Vortec engine. It cranks perfectly when cold, then after driving 20-30 minutes its starts sputtering and then shuts off, like it stops getting fuel. After sitting long enough to cool down some it will crank back up and run briefly before doing it again. If it sits overnight, it will crank fine and run 20-30 mins. and do the same thing. I changed the fuel pump, fuel filter, and fuel pressure regulator, along with the fpr vacuum line. I ordered an iacv and tps when I ordered the fpr, but the throttle body is different than the ones they show on the DIY videos I've watched and they wont work on mine, so any input on why the TB is different, as well as why its shutting off would be greatly appreciated.

 

hey boss, were you able to figure out the issue? Im going through the same exact thing.

 

Damn, sounds like a bad fuel pump. I know you said you changed it though. My wife's car was doing the exact same thing. It would run great, then fuel pump would heat up and stop working. Would let it sit and cool off and then it would work great again for a short time. Hope someone can help you here.

 

OK, here is the drill.

Provide the following information - Year, Make, Model, Trim Level, Engine Size.

Have you scanned the OBDII system with a decent code reader/live data scanner to see what Diagnostic Test Codes (DTC) have been set? If yes, what are the Codes. If no, then get the OBDII system read! Remember, a DTC tells you that there is a problem with a given circuit or a system. It DOES NOT tell you that a given part is bad, and do not let a parts store employee talk you into purchasing a part before you diagnose what is causing the DTC to be set.

Have you tested the fuel injection system pressure? If not, then do so. If yes, what is the pressure.

 

Did you ever figure out the issue? I have the same issue on my 99 silverado 4.3