What noise does the engine make when Jetta accelerates?

Empirical judgment: the engine of Jetta 08 plops when accelerating, because the spark plugs of some cylinders are not easy to use, the fire is broken or weak, which leads to plops, or the air intake branch pipes of some cylinders are leaking. Suggestion: When the hot car is idling, check which cylinder is not working well by breaking the cylinder, and just replace it with a new spark plug.