Norwoods post (although most had already been said in the previous 10 pages) really got me to thinking.
The part about it's a great day here in Chicago!!! Perhaps if you two live close to one another, he would be nice enough to check the car out for you. Shouldn't honestly take that long to do the checks we all suggested and he more than certainly sounds like he knows what he is talking about. It would remove the "he said, she said" from the posting and maybe give you a good "go to" guy thats a straight shooter and knows his stuff.
For 10 pages we have suggested (some taken, some not) clean the exhaust, take it for a long drive, check the lines, perhaps its the valves, guides, take it to a mechanic, remove the exhaust, etc etc etc....I think we have covered all we are able to (based on both parties skill set) without laying hands on the car.