When I wanted to clean out the crud, I would just spray carburetor cleaner down the carburetor and that would take care of all the build up. But, with an injected vehicle, I feel a little lost. The problem that I've been having is that I keep getting carbon pieces flaking off and getting trapped in the EGR valve. The intake manifold should be removed to properly clean the carbon buildup from the inside of the manifold. On engines with high mileage that are starting to use oil, the oil causes a carbon buildup to occur at an accelerated rate.
Any advice is welcome.
Somehow, do whatever it takes get the piece out. Try long needle nose pliers or some kind of a flexible grabbing tool. If worse comes to worse, disassemble the engine, removing the intake manifold to get the piece of metal out. Truck runs good but exhaust manifold turns beet red after running a while. Check fuel mixture, it may be incorrect.