dvzzz Posted September 29, 2019 Share Posted September 29, 2019 (edited) Sorry for the double post, initially placed this in the wrong forum. My first post and my first GM truck. Came to American trucks from the world of Japanese 8-cylinders. I bought 5.3 Yukon as used with 7500 miles on it, still in warranty. While I like how this truck drives the idle seems to be unstable. Problem: When I stop this 2018 5.3 4x4 6-speed Yukon SLE at the traffic while transmission is in Drive (fully warmed up engine) the idle is fluttering (feels like hear misses a beat, tach needle moves a tiny bit too). I am sure that dealer will not detect anything or see anything and classify all is normal, however 2019 Tahoe 5.3 that I drove in is butter smooth. I am wondering if there are ways for me to narrow down the problem with idle. I know it could be dozens of things from leaky intakes to spark plugs or injectors. I hope this community points me to the areas to check. Thank you in advance! Edited September 29, 2019 by dvzzz Quote Link to comment Share on other sites More sharing options...
Bob2C Posted October 2, 2019 Share Posted October 2, 2019 Just had my 2018 Tahoe engine mounts replaced for same issue.. TSB 17-NA-166.. See this post as its talked about here.. Quote Link to comment Share on other sites More sharing options...
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