Had a similiar incident with my building buddy when I was safety pilot for him while he practiced his IA's in his Cozy MKIV. Engine lost power as we were climbing out and then the engine started shaking so bad we thought a prop blade departed the hub on his 3 blade MT. Cylinder #4 went completely dead pretty quickly. Long story short, when I started pulling plugs, # 4 was wet and all the others were coated with soot. Started pulling injectors and found #4 with a particle of some substance blocking the orifice. Poked it out and cleaned all the injectors in Hoppe's #9. All good. Hope your problem is as EZ to fix.
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David C.
Howell, MI
RV-10: #41686 Under Construction
RV-9A: #90949 Under Construction
RV-10: #40637 Completed/Sold 2016
Cozy MKIV:#656 Completed/Sold 2007
"Donor Exempt" but donated through Dec. 2020
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