I read up some online and decided to order new ignition coils. Took a few days, but I got four new coils and threw them in. Again, problem solved it seemed. No more EPC light, misfire codes didn't come back and no more rough starts.
I have them with APR Stage 1. R8 coil packs are not really an upgrade that people make them out to be... red = more performance.... Sure they came out of a R8 and V8 Touareg "BAR" engine code... but the coils make enough current to get a spark. The spark plug does the rest, and the features of the spark plug help with getting the air-fuel mixture ignited and burned. Because of the popularity of the red coils, you can often get them cheaper. I think last time I paid about $100 for the Bosch red coils from ShopDap.com
Latter changed the ignition coils with genuine R8 coils and checked the plugs. The car improved again and response at 1400 RPM was better, but the engine still vibrates at idle.
I never use aftermarket coils, nor would I. I have taken out too many bad ones. In fact, a friend put a set of some parts store coils in his daughter's Tiguan, and two weeks later one died.
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