complacentsee

Woops I missed this. random multiple is more indicitive of a fueling issue/metered air than coil packs, power output stages or plugs.

skinnytirez

16684/P0300/000768 - Random/Multiple Cylinder Misfire Detected
Possible Causes

* Air Intake System leaking
* Fuel Supply faulty
* Injector(s) faulty
* Ignition Cable(s) and/or Spark Plug(s) faulty
* Ignition Coil(s) faulty
* Exhaust Gas Recirculation (EGR) Valve (N18) stuck/open
* Camshaft Position Sensor (G40) faulty

Possible Solutions

* Check Misfire Recognition
* Check Air Intake System
* Check Fuel Supply
* Check Injector(s) and Injector Sealing
* Check Ignition Cable(s) and Spark Plug(s)
* Check Ignition Coil(s)
* Check Exhaust Gas Recirculation (EGR) Valve (N18)
* Check Camshaft Position Sensor (G40)

AUDI_S4_ATL

vibration in the steering wheel is front end suspension,wheel bearings, or cvs and vibration from the seat or center console is bad center support bearing or it is misaligned. Remedies for this can be as easy loosing the center bearing bolts x2 13mm and pushing it forward as far as it will go and making a mark for both sides and then pushing it back towards the rear and doing the same thing, marking both sides and then finding the center between the marks in the front and rear and tightening the bolts down. If this doesnt help or quiet the thing down check the rubber around the bearing for damage if so its probably the culprit if not then the rear differential mount needs to be checked. Also the transmission, engine, and snub mount would also be other probable cause but for the rear mainly the rear differential mount, trans mounts,and center support bearing would cause the seat vibration.