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It's time to change coils whether your car is modded or not. I would also change spark plugs at the same time to eliminate another possibility. When coil/spark plug stops working, it will cut fuel and deactivate that cylinder firing.
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2019 Cayenne Turbo
Gone but not forgotten:
2006 2.0T A4 Avant, 2007 Z4 Roadster 3.0si, 2006 M Roadster, 2013 550i M Sport, 2015 Cayman S, 2015 X5 50i M Sport
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