2002 chevy silv 2500hd crew cab
2002 I got it off a friend in 04 ..I have maintained the truck since then 2 new hub housings synthetics in everything ..just the other day..it didn't want to crank was cold outside (14 I think) and it didn't want to crank..battery low..so I jumped it and when I did it would run fine for like 10 sec then rpms would drop and I could hear some (puffing in the exhaust)..so I put foot to her and she slowly reved up and went running like normal..as I was waiting for a couple of ppl to get there..i reved it a few times to make sure it was running ok..when I did the speedo would rise when I reved.. so i headed out it ran fine until i got to a 2m bridge with a incline..got 3/4 up it and truck started bucken ..i put foot to it and got to the top and half way down other side then it cut off..hasn't cranked since..im thinking fuel pump..would like some opinions before i start out