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Slight stumble at 1,200-1,300 RPM

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JoeyC

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Any thoughts on possible causes? Flew it for 2 hrs this morning and was fine (about 60-65° outside. (It’s now 90° and density altitude of 2,000), pretty humid out
Just now, took it out to do one loop around the pattern to heat up the oil to chNge it. I noticed when I slowly advance the throttle, sometimes it would stumble, drop maybe 200 rpm or so.
Was ok in pattern, did it on taxi in. I have to almost move the throttle really really slowly to get it to happen.

Any thoughts?
I used Camguard since I got the airplane about 50hrs ago

engine was overhauled 375 hrs ago, annual done 2 months ago
 
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