Here is the story. 2005 beetle conv. 2.0 gas, 46k. All original except for tires. The bug sat for a few months. The wife started it and headed for fuel on a rainy day and car ran fine. After fueling the car ran poorly backfiring and misfiring as she returned home. I originally thought that she must of drove through standing water and that it would dry out. I told her to park the car due to a flashing CEL. I added dry gas and plugged in the Ross-tech VCDS getting following codes(17769, 17978, 16497, 16684, 16687, 16688, 16685). After visual check I cleared codes and restarted the vehicle and the 46684 16687 16688 and 16685 codes reappeared. Like I said 46,000 miles so original plugs, wires, coil etc. So where should I start? Could poor fuel or dirty filter throw all of those codes? could a faulty Coil cause both sides of the coil (1 ,3, 4 cylinders) all misfire? I would appreciate any help before throwing $ away. Thanks for any direction.