If you can not find a malfunction in the engine, I'd check the reporting sensor and reading gauge. Wouldn't be the first sensor to go bad.
An unemployed Jester, is nobody's Fool.
the only real difference between a good tracker and a bad tracker, is observation. all the same data is present for both. The rest, is understanding what you're seeing.
~Molɔ̀ːn Labé Skýla~
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