Funny you should mention this problem. I replaced my AMM about a year ago when it exhibited the same symptoms. Unfortunately I reconnected that hot air duct to the exhaust manifold without checking to see that the temperature controled valve in the air cleaner assembly was working properly. It only feeds hot air off the exhaust manifold during start up. After that it supposed to draw fresh air from the front of the car. When this thing fails, it defaults to drawing in the hot air source. End result is that your AMM overheats and burns out. A new AMM costs $560 and the rebuilds are about $300 to #350 but are not terribly reliable. Try one from a Pick and Pull and just make sure that air cleaner control valve is working or disconnect the hot air hose.

Good luck!

Dean