[TxMarine]

I've got a 2008 with same engine. One day I started hearing what I thought was a lifter sound. I let it go for a few days until one day I decided to look into it, I would hear it when I opened drivers door coming from underneath the cab. A 'ticking' sound. I started checking the engine compartment and one of the first things I checked was the spark plugs. Sure enough, I noticed the number 7 plug wire 'wiggling'. The spark plug was loose. Tightened it up, no more ticking sound. so you may want to check all of them.