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2009 Cayenne 3.6L, VR6, 110,000 miles. After driving about 5 miles from home, car started to run rough. I immediately returned home. Scanner indicated P0305. I pulled #5 ignition coil and switched it with the #1. After clearing code, I drove car for about a mile with no problem. I’ll get a new coil for a backup. Any thoughts? Can coils be intermittent? I’ll add injector cleaner to fuel.