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I have a 2017 with longtube. Threw the bank2sensor1 o2 open code and then went off 2 days later and the idles is bouncing from like 500 to 1000at idle. Super frustrating and can't figure out what's going on with since no codes now

Thank you. The code is cleared and not in memory and hasn't come back on, that's what's throwing me off. I'm guessing either vacuum leak somewhere or tune issue, but not sure on either.

Help Rookie Question: last week had a day of pouring rain, next day went to drive the Mustang and the CEL came on reading (P2254 - Oxygen Sensor Reference Ground Circuit Open - Bank 2) and started having idle issues. 2 days ago the CEL went off on its own, but the idle is still surging from...