Originally Posted by Novatd
As for mods I just bought this truck and not sure what all was done. The P.O. said the engine was rebuilt 20,000 miles ago didnt say by who.
Okay... Had we known this up front, some answers may have been different.
We were answering under the assumption that the truck used to run properly and it got worse without you making any changes to the engine.
Was it running properly when you bought it and it suddenly dropped, or has it always been like this?
I'd be inclined to agree that one cam may be out of time. Installing the timing belt is easy and it is a bonehead move to get the cams out of time, but if the "assembler" is not paying attention, it happens.