sry about the lack of info on the truck... yes the truck does smoke but its always a dark black fuel smoke which should be due to the fuel plate and star wheel... the truck is a 5 speed with a gear vendors over under drive running off staight diesel no bio diesel and has over 330000 miles, ive read some things on the over flow valve and the symtoms seem to be the same, the truck doesnt want to idle and will stall, it also starts hard and i would have to tap the throttle to get it to start. these symtoms came slowly and eventualy got worse till the truck became impossible to drive....