Truck runs normal when dry but whenever it rains the engine hesitates and putters badly at times. I have done many things to try and resolve to included replaced distributer and rotor, new plugs and wires, changed the fuel filter but nothing seems to have worked. All parts replaced are original as well. I even took it to a dealer and they checked errors and found one to replace water temperature sensor. I replaced that as well and no difference. Dealer spent several days trying to find the problem and by that time it got dry and ran normal thereby thinking its fixed; that is not the case especially since it has rained and running terribly and at times dangerous during moments of nearly no acceleration.
Does anyone know what the problem might be other than trying what I've stated? This problem has been persistent and frustrating because the truck runs great at other times and I am the original owner.