Stopped in at Autozone last night to have them check for codes but found none. As for tune up, plugs were replaced last summer, dealer ran it through their fuel system/injection cleaning system. There were a couple of plugs that had an issue, I'll try and attach a picture later. At the time, it was throwing a cylinder mis-fire. Changed the plugs and everything was fine. I wondered about an injector issue but wouldn't that cause a problem no matter what speed/rpm, even at idle?
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I've seen some mention checking the catalytic converter and exhaust system for clogs, how do I go about doing that?
