Well as the title says its an 05 LS V8. I was getting the rattle/knock at idle and while driving no matter what and It was on the driver side of the engine. Also Loss of power. Check engine light is on so I got it scanned, came up with all the coils malfunctioning and timing too advanced. Which led me to believe that maybe that timing tensioner that goes out on the first gens went out or timing chain is somehow getting too much slack somewhere. So today I pulled the valve cover off and checked the secondary timing chain tensioner. no slop in the chain and there doesnt seem to be any loss of tension through pushing on the tensioner. Any thoughts would be appreciated.