Have you drained the oil out of the regulator? I have run into a couple of problems with the idle and have found either the air valve on the side of the carburetor gummed up with oil or the lp regulator n/g. The air valve is on the side of the carburetor where the lp hose is, it is held in with 2 screws. Take it out and clean it. The best way to diagnose is to have the hand held and get readings.
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