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Thanks for the reply. I still suspect a pressurized crankcase, as as soon as I turned the fill cap, air was expelled and the engine rpms increased, and the miss/backfire disappeared. Retightened the cap/dipstick and the rpms dropped and misfire came back immediately.

Hello All. My neighbor picked up a mower for $20, asked me to get it going. It’s a Troy Bilt with a Briggs and Stratton 550EX, 140cc motor. Motor model 09P7020144F1. Engine made in 2019. Initial issue was it would start but quit quickly. Found fuel was saturated with water. Drained...