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  1. So I thought too maybe it was bad gas. Took to dealer once had generic 300 code then light flashed again stopped by dealership said it was same code so a tech went and go scan took I had misfires on 1&6 said they’ve had a lot of issue with the lifters collapsing due to a bad batch of parts. So next week they’re replacing all lifters.the tech also said usually by 5000 miles they will fail I’ve got 2700 on mine.
  2. Did switching gas help with the misfire? My 21 Sierra has done it twice now dealer found p300.
  3. I hardly set my parking brake and it does it every time usually not when backing up but just forward until I hit about 15
  4. Haven’t been able to fix the issue yet plan on trading it in quick, mine has steadily gotten worse with no help for my service department
  5. Anyone found a solution to this? Mine has been doing it for 4 or 5 months getting more frequent. Only does it after sitting at work all day and leaving the garage once I get up to speed it doesn’t do it.
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