My father in law has a 1984 Chevy Silverado with a 6.2L Diesel. The truck has a couple hundred thousand miles but has always ran good. Recently it has started smoking. It puts out alot of black smoke under acceleration only after the engine warms up. Not when it's cold. He is a diesel mechanic for tractor trailers but hasn't come up with this cause. He has replaced the injectors, the truck seems to have more power but still smokes alot once it warms up. I'm hoping this means something specific to someone because he's baffled and about ready to sell the truck.
Thanks for any help.