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Message: <blockquote data-quote="Rjohnson" data-source="post: 21377" data-attributes="member: 7811"><p>I think its in the engine. its not speed related its rpm related as it does it at all speeds when your close to 1200 rpm. Also the engine was updated in 23 with 5 more horsepower and that's when they started to have engine vibrations problems. These are the 2 TSB's that were listed on my service report. There not that easy to find. I used a different search engine to locate 23-na-129, 21-na-122. What ever it may be they refused to  fix it and want 4k to trade up into another vehicle  after 2.5 months of ownership. In their words they want to charge for selling me a defective vehicle!   DONT BUY ONE! DON'T BUY GM!! They are no longer standing behind there products</p></blockquote><p></p>