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This is how I cleaned my 8 coil packs. Before doing there was random vibration felt from inside the car and more noticeable when touching the intake manifold. There was also hesitation when during hard acceleration.
After cleaning all 8, random vibration which was noticeable during idling at stop light was gone. The hesitation during hard acceleration is gone as well. Sharing this as this might do the trick for yours with the similar symptoms.