I agree, sounds like the rings are shot, that is the most common problem leading to oil fouled plugs, how many miles are on the engine? And also is the egr valve vaccum leaking? If not then you can clean it out and shouldn't need a new one, as for the throttle body what is it doing that you need to replace it? I just rebuilt mine, the kit cost 35 bucks plus like 5 for shipping from new york, the company was all state carburator in long island, sorry i don't have a number, unless the actual unit itself is cracked this kit will completely rebuild it, minus cleaning of the parts before re assembly and it was fairly easy, hope this helps.