I get questions about engine performance issues all the time and one of the things I tell people to check for is a vacuum leak. This video is pretty straight forward in it's approach to finding a vacuum leak. On thing I might mention is that not all vacuum leaks are at the engine, some HVAC systems run on vacuum and can cause a leak under the dash in some cases so don't forget to look there. I've even seen vacuum operated door locks, that would be fun to find. Just be sure to be careful spraying flammable stuff on a hot engine, you don't want to take one problem and make it a whole lot worse.
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