im gettting a really rough idle the past 2 days. i can hear sputtering and a "tick". both are pretty inconsistent. the exhaust smells a bit more of fuel. o2 sensor was replaced less than 30 days ago, maybe 1200 miles? got a dyno tune less than 2 weeks ago. plugs look good too.
im stumped

 

WTB a piece of that kit kat bar?

Maybe the IAC?