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C90 missing on throttle up

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hunt-trapak88

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Green on the stick. Engine/carb 75 hrs on fresh overhauls. Marvel carb. Live in Alaska, temps are 15-30 right now. Been flying since nov. Starts fine, idles fine, runs fine when climbing/cruising. During takeoff, or when Ive cut power in the air and want throttle, it stumbles around the 1500 rpm range. On t/o I've made sure to advance throttle slowly, almost a 3 count. It does it sometimes, sometimes it doesn't. It stumbles for a second or two then takes off like it should. I've tried keepin carb eat on until full power, but doesn't really seem to help..maybe at times it does. Yesterday I throttled back and dropped to 300' to look at something and when I went to climb out, it stumbled on me..not a good feeling. I've seen the baffle plate in front of the air filter, which I'll try. Any other ideas.? Thank you
 

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