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Audi A4 B6 1.8T 163km after chip for about 200km. I noticed uneven engine operation after morning start. While searching for a solution I checked: - new spark plugs, - ignition coils, - checking the injector harness, - the suspicious coil harness was replaced with a new one, - compression checked. Finally, the diagnosis of head cracks was made using an endoscopic camera inserted into the cylinder through the spark plug hole. After replacing the head, the problem with misfiring and jerking disappeared. Correction: Key to turn the shaft 19.