Ive been noticing here lately after i drive for 30-40 minutes and come to a stop and start out again my truck acts like im trying to start out in 4th gear. I dont normally use 1st gear when starting out from a stop unless im on a steep incline. I usually start in 2nd gear. Since 1st is pretty much pointless from the gearing. The engine runs smooth even when it is lacking power so to say. After i get moving it will accelerate as it normally has its just when i start rolling when it starts to act up. Ive done plugs, wires, cap and rotor about 2500-3000 miles ago. I dont know if it might be a fuel pressure problem as I don't have a pressure gauge to check it. I am going to do a fuel filter this weekend and see if I can rent a pressure gauge. I have no idea if the fuel pump has ever been replaced. I do not have a check engine light at any time. Right now im at a loss at what it could possibly be and just bouncing some ideas around. I don't know if a plugged cat could cause this. Im wondering if after driving it that long everything gets warmed up it starts to restrict flow. The truck is 95 2500 5.7 with 236k.