review when last tuned . it may be due. rec. every 50,000 miles. rec. fuel system clean. ethanol treatment to 1 tank of premium. ethanol blend in in fuel cause build up in fuel system, combustion chambers, exhaust and causes increased wear to spark plugs. a clean fuel system always runs better. result takes some drive time so be patient. bring to a shop for diagnostic run to find any issues u need to be aware of.