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Q:

Engine vibration when stopped at a light. No warning lights come on. on 2002 Chevrolet Trailblazer

Rookie cbe0621eac06868b3efe0d8d1d3611e23c60d3114864ea2ec19a68cfbd3eebab
Usually stops if put into neutral. I cleaned throttle body.
(1) Answer
On those trailblazers, there are a few things that can cause a vibration when stopped in gear at idle. With mileage and time, the engine mounts wear out and collapse and can cause vibration. The water pump shaft can develop play and allow the pulley to wobble, as well as the fan clutch (which is quite pricey on these vehicles) can also cause a vibration if it has play in it.

If you would like to bring in your vehicle for a diagnosis and quote, please contact me at pilonej@autonation.com