For once, I can compensate you for your assistance. Anyone want to come out tomorrow afternoon and help me find out why my HVAC is poisoning me? All I need is someone to hold a piece of cardboard (I can supply the cardboard) on my tailpipe while the engine runs so that I can find the leak.

EDIT: nevermind, Just remembered that I need some cutting/welding done on the exhaust anyways, so I might as well just have them do it. Can an admin please delete?