Anyone else having issues with their Yukon Denali's fuel injectors? I've had to have 3 replaced so far... the car is barely over 2 years old and had 48k miles when i replaced the last injector. I only run premium in this rig. Between these issues and the transmissions problems and now my A/C has gone out... I'm starting to think I got a lemon... but it seems like I'm not the only one with these issues. Anyone else having chronic problems with their powertrain? I've already engaged GMC Customer Care over a month ago... so we'll see how GM treats their customers.