Hi guys wondering if you could helpe out with a problem I had a check engine light come up then my truck started to idle real low at stop lights and start to bog out then I'd have to floor it to get it back up and running they code was for a o2 sensor so I changed them and the problem still persists.
I had a new magnaflow cat put it on 3 months ago
Wondering what else could cause this problem.

 

And all the ignition wires and plugs are new

 

remove the TB and clean it and the IAC on back. While the TB is off check around inside the intake for oil.

 

and don't forget to have the battery disconnect while you are cleaning things.

 

Thanks guys that cleared it all up