When the truck is cold it runs fine, after its been at operating temp for a while I get bad hesitation. Right off the line it tries to die out, while driving if I try to accelerate it dogs out for a second and then goes. This sounds like the plunger in my carb, I just don't understand why this would be a thermal issue. My transmission I just put in is now making the same weird grinding sound the last one started to make a couple thousand miles before it went bad. IM SO TIRED OF BUYING PARTS!