Try the crank pisition sensor that is vary likely to be the couse of your misfires its working but its intermintly shorting out telling the pcm that you have a misfire and setting the codes
If this vehicle has single pencil coils for each cylinder, these are common for breaking down, a regular problem for all vw audi group. i would replace them.These parts are availible from most motor factors.
P0300....Random/Multiple Cylinder Misfire Detected P0301....Cylinder 1 Misfire Detected P0302....Cylinder 2 Misfire Detected P0303....Cylinder 3 Misfire Detected P0304....Cylinder 4 Misfire Detected P0305....Cylinder 5 Misfire Detected P0306....Cylinder 6 Misfire Detected P0307....Cylinder 7 Misfire Detected P0308....Cylinder 8 Misfire Detected P0309....Cylinder 9 Misfire Detected P0310....Cylinder 10....Misfire Detected P0311....Cylinder 11 Misfire Detected P0312....Cylinder 12 Misfire Detected P0313....Misfire Detected with Low Fuel------ could be a ecu problem ,you would need to check coil pack with a scope to see if its defective if it appears ok then its the _ECU
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