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Good compression test numbers, possible timing chain slack?

Nightflyr *
Richard Kirshy

Anything is possible …
But going by your description.
Has your mechanic or yourself checked live data on both STFT & LTFT @ both idle and ~3,000 rpm?
Perhaps the MAF or MAP sensor.
Beyond that ….
I would be look for a vacuum issue, where a smoke test comes in really handy.