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Reply To: 2016 Suburban 5.3 rough idle

February 20, 2020 at 2:27 am #588895
Bob2C
Participant

Yep. My 2018 has been like that since new. Dealer replaced motor mounts under TSB. It helped but I couldnt take it anymore so I got a Diablo Sport Tuner and raised the idle 100 RPM while in drive. Smooth as butter

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