My '99 C2500 will intermittently lose power as if it's suddenly receiving no spark or fuel. If I back off the throttle completely, sometimes I can get it going again, other times I have to pull over and it'll stall. However, each time it starts right back up and it'll run fine anywhere from a few seconds to 10-15 minutes, then it starts all over again. This happened a couple random times over the last month or so but then started acting up regularly the other day. Also, over the last year or so, the truck would take 5+ seconds to start. Maybe fuel pump issue? I did a tune up yesterday consisting of platinum plugs, wires, cap & rotor, and fuel filter. Had my brother hook his scanner up to it, no codes found. Truck is a 5.7/auto, 2wd with 125,000 miles on it.

 

I am having the same kind of problems with mine but mine is a 91 k1500 sometimes it idles rough and anything more than have throttle feels like it is missing or starving for fuel. No codes show up either. I replaced the tps, map sensor, fuel filter, plugs, wires, cap, rotor, egr and took the catalytic converter off. No difference what so ever. So if you find out whats wrong with yours let me know so i could give it a try...

 

Did you find out what has causing truck to stall? Having the same problem with 2002 Surburban. It stalls when you try to accelerate after it has been running for about an hour.