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IO360 running rough low rpm?

Hello to all. I just recently replaced my hartzel C/S 2 blade for an MT 3 blade composite. I have the IO 360 a1b6 mooney engine. After the new prop, ive been noticing a rough idle and instant drops of about 200 rpm in the 800 to 1200 rpm range. Runs smooth at high power. Mags are good. Tried different mixture settings..Could it be because the new 3 blade is 12lbs lighter or something with the way the prop is mounted relative to the crankshaft? Maybe my idle mixture needs to be adjusted? Thanks in advance.

David 194PT
 
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