Any further updates on this issue? This shivering / hesitation issue when idling in park or in gear has existed on my vehicle since 5,000 miles. I have a 2015 GMC Yukon XL SLT. I am sitting at the dealer for the fourth time trying to get it fixed. They have previously replaced the engine mounts, cleaned the throttle bodies, but still not fixed. I was told by a friend that this may be a loose spark plug or spark plug wire issue. DreamCadi or Nashville GMC can you please advise what the fix is for this issue? My vehicle was made at the Arlington plant as well. Thank you.