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Second then.....pull the spark plugs......you said nothing about them.
Perhaps it's time for a compression test.
When you check them, do so with working end down...I had a ceramic center crack on one plug that took forever to find...with plug pointing up, as you would normally do to see the gap , it looked fine....but when turned over, as it would be in the engine, the ceramic center dropped down over the center electrode and shut off the spark to the air/fuel.
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