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Greetings, I have a 03 Yukon XL with the Bose system in it. All of a sudden I have no bass. What I have done so far is checked the 30 amp fuse under the hood, and that looks good. I have checked my radio settings, and all is good. I have checked that I have sound coming from the front...

Hello this is my first post. I have an 03 Yukon XL with the 5.3. Some times when I start it it lets out a big buff of blue smoke that smells like gas. I have brought it to the dealer several times and they finely said it's the valve seals. I'm looking for second opinions and the extended...