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My 2004 passat has is shaking while idled. What can cause this? on 2004 Volkswagen Passat

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Occurs every time now. We know that we need to change 2 spark plugs. There is a very small leak in transmission we are told.
(1) Answer
Hello, "shaking" can be caused by engine misfire, which could be related to needing to replace spark plugs or secondary ignition items, such as ignition wires. The wires could be breaking down -- they are insulated by rubber which can dry rot over the years, causing spark to escape also. This is just a guess; even a base engine issue can cause trouble with a rough idle. A proper diagnosis should be performed to get to the root of the problem. Good luck.