2011 Chevy Equinox 2.4l random / multi cylinder misfire code.
I have a 2011 chevy equinox 2.4l ltz. It is giving the code random / multi cylinder misfire code and stabilitrak is also on. I just put new plugs in and get oil changes about every 5,000 miles. It is running very rough, stalling, and hesitating while idling and driving at both high and low speeds. It happens in every gear, park and neutral. What thoughts do you have on troubleshooting and fixing so I don't get ripped off by a dealer or shop. It has 100,000 miles on it almost all highway.