I have a 1998 GMC Sierra 1500 Vortec 4.3L, etc. I had to replace the fuel pump a while back (changed filter also, etc), drove fine for a week and then went out again. Replaced the fuel pump once again and drove fine for a week or so and then it would it suddenly started stalling after driving for a few minutes. I had to let it sit for about 15-20 minutes and then it would start finally, but once again only allowed me to drive a few minutes and the it would repeat. Problem started about 50 miles from home so it took me about 4 or 5 stalls, wait, start, go, stalls, etc before i made it home. How did you finally correct your problem?
Thanks for your help I will continue checking this since I have like 2 month with this problem, I will let you know what happends probabliy I will need to take my truck to a dealer,
Regards.
Sounds like a restriction some where in your fuel system example dirt or anything that might get in your system check your filter and look for contamiation or possilbly a airation problem
SOURCE: Stalling
Possibly faulty ignition module is the problem, stalls when engine is hot when you sit for a while it cools off and runs again until it heats up again, those are usually the symptoms of a bad ignition module and after a while it may give out all together and not run at all, usually if the module is at fault it shuts down the fuel pump so the engine don't load up with fuel, do to when engine continuously cranks over the injectors never stop squirting fuel and flood the engine do to lack of spark which is produced by the module, this could possibly be your problem.
SOURCE: 2006 gmc sierra 1500 stalled and will not start.
i have a 06 sierra that done the same thing and it was the distributer gear stripped
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my truck is a 1998 gmc sierra 5.0 305 8 cil vortec and it does the same it turns on fine then when I want to accelerate it turns off, I have changed the fuel pump the distributor cap and the rotor and I checked the fuel pump pressure and it's fine too,
I you find an solution I will apreciatte it very much....
stalled when slowing up for traffic,started it again, made knocking noise then stalled while driving and will not fire; changed fuel filter still will not fire;
over a few weeks the engine sometimes stalled while coasting in traffic; would start again; then after going a short distance and turning car off for a few minutes it started hard; then on way home there was a knock like sound and it stalled with a pop and will not start again. Changed the fuel filter , will crank but not fire
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