You could have an injector massively leaking out fuel into one of your cylinders. I know you said there is no leaks which is very broad so I am assuming your O-RINGS. But a rebuilt injector could be faulty. Smell your engine oil, since all the liquid gasoline that is in the cylinder will drain into the oilpan. Or pull out sparkplugs and shine a flashlight into the hole to see the cylinder tops. I have had that happen to me too.
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