[90gmcmoneypit]

Check your spark plugs again. Look for buildup on the electrode. Oil leaking into the piston from either the piston ring or valve seal will cause a buildup of a brownish ash on the spark plug, making spark impossible. If the buildup is on one side of the electrode, it's a common indication of bad valve seals. If the buildup surrounds the electrode entirely, it's indicative of piston ring failure. Also check the EGR valve for any debris.