Where to start?
1999 Audi A4 Avant, 1.8T 85,000 miles. Blinking check engine light, than solid. Able to drive car home. Vag-com codes 16685 thru 16688 which identifies all 4 cylinders having a misfire. Timing chain replaced at 70,000 miles.
Because all of the misfires occurred simultaneously, I doubt it is plugs or wires. Coilpacks? Other?