My 2010 Pilot was running like a dream at 105,000 then I had the timing belt replaced because of the service minder code said it was time. I had the service done at the Honda dealer. Six weeks out and now I regret it. The engine has a rough idle and I have also noticed that there is a sputtering sound coming from the rear exhaust. No check engine or code indicators have appeared...will an engine tune up correct this?