I think you have a intake gasget leak on more then one cylinder. Mine is all stock with 212,000 and I had a melted one on #1 when I changed plugs for its second tune up and it was missing this cured it but now its missing and pinging. The dealership told me it needed a gasget 25,000 miles ago when it was in for the valve cover gasget recall but I blew it off.That would explain high cylinder temps.