Bought this 06 about a year ago with 120,000 miles. Didn't have any whine. 10,000 miles later a timing chain tentioner failed. I replaced all three tentioners along with the larger of the three chains. also replace plugs and water pump while I was in there. All put back together and it's missing on one cylinder:cussing:. Now I'm like:dontknow:. My thoughts are coil, plug, bent valve. Anyone know what the likely culprit might be?