My 2013 Tahoe has a rough idle when in park. I opened the hood and you can see the engine shutter/shake, I"m assuming that's not good. I use regular unleaded, usually the 92 octane and have added 2 bottles of STP fuel cleaner to the gas tank. I have also replaced the MAF sensor and still no luck, vibration exists. The engine has around 76k miles on it. I am a little disappointed because I traded in my Tundra for a Tahoe, and the Tundra did not have this problem at all, you could sleep in it and easily forget the engine was running. The Tahoe shakes so much when in park it almost feels like the engine will stall. Has anyone figured out a solution to this common problem with Chevy's?