Hello. I have a 2010 audi a4 avant with a 2.0t ea888 with 140,000 miles. I have recently been having an issue where when it is idling it is very rough and vibrates the whole car. I had it at the dealership a little while ago for a random multiple cylinder misfire that went away as soon as they pulled it into the bay. No issue was found, timing chain not stretched, etc. Any ideas as to the poor idle?.