First off just want to say hi I'm new here I just bought a 91 GMC k2500 and it's been off the road for three months,now I drove it 4 hours home today and half way through my drive it started to hesitate like it was starving for fuel then it cleared out,did that a few times and I just nailed it and it cleared,now I got off the highway and still had about a 15min. ride left and it hesitated the hole way and the idle was up/down,now would that be water/dirt or something else?????Any ideas??? it has a 92 350eng. in it,and is it a carb. or TBI,thanks for the help Bob