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Go back and check your plug connections. It sounds like a bad connection. How many miles on vehicle? the plugs are meant to last 100k....
The LT1 does not have a smooth idle btw...
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2019 ZL-1 Acquired 4/23/21 at 6300 miles. Riverside Blue, A10, PDR. Traded in 2017 2SS with 6M and 32k miles. Continental Extreme Contact Sports. Now has 10,000 miles...
2012 Yukon XL Denali w/ 6.2 AWD
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