Im almost positive that the egr valve is the main issue. Problem is I cant seem to find it. I cant figure out how to post a freaking picture on here without a url address, but I would be more than happy to send you pictures and maybe you can help me find it? It would be much appreciated. From what I can see there is no egr valve behind the carburetor or anywhere else bolted to the intake manifold. Heck Im so confused at this point Im not even sure its the right engine for the truck.