98 1.8t 70k. Driving home car stumbled and got flashing CEL. Hooked up Vag-Com and got codes 16684 & 16686. I had the car towed to my house. I am pretty sure it is either a coil pack or the ICM. How can I determine which it is. Cylinder 2 is always misfiring then I get the random misfire code. Can I switch coil packs and see if it misfires in the exchanged cylinder? I need to determine which part to order and get back on the road. The 90 Comanche doesn't cut it for work.