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Loss of Power - 77 Archer

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Joined
Dec 17, 2016
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Hello Forum - I went up today (Sunday), did some touch and go’s. I did a full stop landing, taxied back for takeoff. I started to lose power at around 3000 feet. I could only get 2200 RPM, and seemed like some slight vibration. I brought it down with no issues – circled over the airport to land - and taxied back to my hangar. I did a runup – no issues. But with wide open throttle on the ground, I could only get 2250 RPM, no vibration. Fuel flow was good both with engine pump and with electric pump. Popped the cowl - didn't see any loose wires.

Lycoming A4M, 1977 Archer

Any thought on what might be happening? Going in the shop tomorrow, but your insights always seem invaluable.
Thanks, Eric
 

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