Bucking Truck

[chris_hummer]

I have a 98 chevy pickup with the vortec V-6. when it is cold outside the truck wants to spit and sputter at all rpms. It is mostly noticed when there is a greater load on the engine such as taking off in second gear. Any ideas?

[hairpen]

Originally Posted by chris_hummer

I have a 98 chevy pickup with the vortec V-6. when it is cold outside the truck wants to spit and sputter at all rpms. It is mostly noticed when there is a greater load on the engine such as taking off in second gear. Any ideas?

i have a 96 chevy k2500 5.7 i bought last year in late fall when winter (ohio) hit it started bucking (hesitating) under light load i replaced all kinds of stuff plugs wires, tps sensors checked fuel pressure it was good put new pump in anyway fuel pressure regulator cap and rotor fuel filter still no fix i had two trucks at the time so i just didnt drive it then spring came and i started messing with it and it ran great i install septic systems so i pull equipment ( bobcat trencher) at least every oyher day not a single problem for months 17,000 miles half pulling between 8,500 and 11,000 lbs. i sold my other truck and two weeks ago on the first cold morning its back now tthis is my only truck go figure today i checked fuel pressure it was fine at idle 53lbs. so i fished the gauge so i could drive and watch and when it bucked pressure dropped to 40 how this relates to cold weather i dont have a clue so i han a test light from the hot wire going to the pump into the cab to see if i lost power to pump but the light never flickerd so i am getting power to the area of pump sp tomoro im pulling bed to see if i can find somthing there maybe a ground. i cant belive its my pump it never changed last time.i also tried the iintake air sensor $ 12 but didnt work for me ill let you know if anyone can help us please relay relay changed that to

[jveik]

maybe you are experiencing a mild vapor lock type of problem in your fuel lines? just a shot in the dark lol...