It has happened ever since i got the truck. I thought the normal things replaced fuel filter,replaced air cleaner,put fuel sysytem cleaner, and nothing helped. It used to do it at about 65 but here lately you cant even get it to 55 hardly without starting to backfire and smoking(black and blue).And i do have a service manual for it as well. Thought maybe fuel quality could be it but it doesn't matter where you go.Also thought could be water so i drained the tank and cleaned there was very little water in the tank also checked and drained water out of filter with no results. It honestly almost sounds like a popcorn popper when it does it.I honestly think it is fuel startvation as well but I have replaced lines to see if that would help it doesnt.Unless maybe there is a secondary pump before injection pump or something my manual that i ordered from chevy doesnt say anything about it. Let me know if you need anything esle Thanks.
I dont like my truck not running
Also just a note it does great in terms of oil usage doesnt use hardly any.But the fuel mileage has went down the drain.