Took car in for service (warranty check) had them go over all the back issues again. They found that the valve cover gasket had blown, leaking oil down front of engine. So changed the gasket and new plugs as the were fouled as a result. Now it tics and for the first several kms it sounds like a sewing machine. Didn`t do it before they did the repairs. My car only likes synthetic oil. Regular or new blend stuff from GM is not good in my engine. Just a note for the oil just incase anyone has an issue with pinging.