Quote:
Originally Posted by jackliu239
.........I think there might be metal pieces in the oil, I will change it tomorrow to see if the problem goes away.
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Was one cylinder colder than the other one?
(Hope you did wear your gloves for touching them).
Try not starting the crazy and endless process of guessing.
We have shown you a method of discarding possible causes and changing the oil is not there.
If you have metal in the oil, it will not pass the filter and there is no way you could hear.
What you describe is either one cylinder missing firing intermittently or marginal fuel supply or valves too closed or autoignition (it sounds like loose metal when you open the throttle at low speeds).
Besides the previous advices, check that the connections to both spark coils are solidly attached.