https://assets.publishing.service.go...CDVF_04-16.pdf
"Four takeoffs, circuits and landings were then flown without incident but the pilot commented, in his report to the AAIB, that that the engine performance “felt sluggish”. While preparing for the fifth takeoff the engine began to run roughly and its rpm decreased before recovering. The pilot checked that the engine instrument readings were normal, the fuel selector was on and that the fuel tank contents were as expected. A magneto drop check was completed after which the pilot carried out two high-power engine runs. As the engine now appeared to be performing normally the pilot decided to carry out another takeoff. Shortly after becoming airborne, between 100 ft and 200 ft agl, there was an uncommanded reduction in engine rpm. The aircraft lost height and struck the ground in a steep nose-down attitude. "
It shows the hazards of taking off with an engine that does not seem to be operating normally. I did it once on a C180 that has been giving poorer than normal performance during the final portion of a climb to altitude on skydiving ops. Engine run at near full power seemed fine when back on the ground. Lost a cylinder on the next flight.