FIX Smoke on start-up 2007-2012 5.3 GMC Chevy Tahoe Yukon SOLVED!! 

This video addresses a very common problem with GMC, Chevrolet 5.3 liter smoking out of the tail pipe on cold start. This is a very simple and low dollar fix that most can perform themselves, thus keeping more cash in your wallet for more important things like beer.
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