2013 equinox rough idle

Hello everyone! I’m banging my head a little on this one, my 2013 equinox 4 cylinder flex fuel started idling a little rough, jumping about 100 ‘ish rpm around but it never dies or feel like it’s going to. I was due for a tune up anyways so I changed the spark plugs and the air filter and noticed no change, I dug a little more and noticed the throttle plate was pretty dirty and grimy, cleaned it and still no change, I took it to the local shop to have the codes scanned, there was no active or stored codes. Any help would be appreciated, thank you!