Just got this truck about a month ago and just noticed a slight miss today. Only happ
 

Just got this truck about a month ago and just noticed a slight miss today. Only happens while cruising, typically in 3rd or 4th gear. It will happen while accelerating or cruising at a set speed. But when I go WOT the miss goes away which is leading me to believe its a sensor. Went to Oreilly to have the codes pulled. There were no KOEO codes and the guy wasn't the brightest, couldn't figure out how to work the reader and just shut it off halfway thru the KOER test. It retrieved codes and I think I saw "1 of 2" on there so I never got to actually see the result. He just hit the power button and said "welp, looks good..." yea cool.

Anyway, there is also some popping from the exhaust when I downshift while slowing, not sure if it could be related. I'm thinking O2 sensor but not 100% on my diagnosis. Any thoughts?