The Cessna 172's persistent 'rough idle' was a tiny crack in the intake manifold gasket that took me a full 8-hour shift to find.

Has anyone else had a phantom engine issue that turned out to be something stupid and cheap, but the diagnostic time was insane?

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Heard about a guy who chased a weird vibration for days. Turned out to be a loose screw on a baffle.

That "full 8-hour shift to find" hits home. Spent a whole weekend tracing a weird electrical drain that was just a glove box light staying on.