The other day my truck (the GMC 2500 at the top of my signature) kept stalling. I'd fire it up, go 200 feet and it would stall again. I took my chip out and it ran perfectly. The past 3 days it ran perfectly so I assumed it was the chip. Today I am all gassed up and ready to roll. My guys show up and one hops in my truck, plows the driveway and he and a shoveler take off to clear out some banks we plow. I am about to jump in my dump truck to go hook up my blade and my nextel beeps. My driver tells me the truck stalled. He gets it started and it stalls again. I put additive in so its not the fuel being gel'd. Anyone have this problem. It has 16k miles on it. I'm thinking fuel filter but why would it run great for 3 days and then start having the stalling problem again? Any ideas?