Took my car in for major service (plugs, filters) to a new indy shop. Was running perfectly. Pick it up last night and misfiring like crazy with CEL on after a couple of miles. VAG COM shows multiple cylinders misfiring, 1, 4, 8, 2 identified, and variable too rich/too lean codes. My son took it back to the shop and they claim also coolant sensor code is tripped, and want to start by replacing that. My first experience with this shop which was highly rated on local chapter forums and Yelp. Any thoughts as to what in the heck happened? There goes my wine country run tomorrow...