I have to agree with our moderator. Excessive carbon monoxide is

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Moderator Post (s) for this thread: > CO mouth of hot air by HKestenholz on 12/25/2008

because of a poorly set air control, not a fault with the furnace! And the soot is from the same cause. It's like saying you need a new engine because the car is running too rich! It just needs to be adjusted but apparently this guy would rather sell you a new furnace?

Find a new furnace guy. Properly adjusted your furnace will run better, last longer, be far more efficent and cost you less to run. It's nothing more than something a quick tune-up can't fix.