Roxy Watches - Recent Questions, Troubleshooting & Support
Just purchased a 2002 chevy trailblazer , 6 cyl,
This happened to mine also. It was a faulty coil pack for one of the spark plugs, each spark plug has its own coil pack. Check the trouble codes to see which cylinder is causing the issue. If there are no codes then you need to take off the throttle body and clean it, this is a common problem with the 4.2L engines. I would do a search on Youtube for a video instruction on how to clean the throttle body. It's really easy and its recommended to be done at each oil change or every other oil change.
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