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sounds like when they replaced your engine, a rocker arm might have fallen off and is now lodged between something. Which means one of the valves isn't opening and closing and depending on where its potentially lodged at, it could have damaged the one next to it too. I've seen a tech do this with some of the same symptoms you're describing. Demand them remove the valve cover and do an inspection. It can be done with the engine in the car, so don't believe it they say they have to remove the engine again just to inspect.
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