Recently purchased Audi A4 2010 with 147000km, has a juddering when accelerating, smooth in all other respects, I cleaned the mass air flow sensor, checked the spark and coil packs, one coil pack is a different design from the others and I am having trouble removing the third spark plug.
Any assistance would be appreciated
Checked the codes came with a misfire in the third cylinder, I checked the coil and spark plug, they where very old and the rubber bottom was stuck to the top of the plug, got it removed eventually and ordered a new coil and plug set, hoping that would fix it. Could a bad coil and/or spark plug cause juddering when accelerating?