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11-16-2012, 11:38 PM
Join Date: Jul 2011
Boat: 2013 Mastercraft X25, 6.0 Ilmor, Pro Package, slammed and flaked!
I've had two Silverados with the 5.3 am they both do this. My Yukon with 6.2 does it as well. I'm told it is common with all GM engines. I add 2 cans of Wynns Engine Tune Up after every oil change and it helps.
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