Good ideas above. One caution, sometimes folks describes sounds with differing terminology. “Bubbling” to one might be “rattling” to someone else. If it sounds at all like rattling, like if you shake a tin can full of a few nuts, washers, screws inside, if it sounds anything like that, this could be the engine is knocking. I mention this b/c knocking almost always occurs during accelerations, and if that’s the problem it needs immediate remedy as it can damage the engine internals.
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