General LSX Automobile Discussion - 02 sensor problem?

A while back I got some water in my gas tank and after changing several fuel filters and using some additives to remove the water I have a problem. During normal driving the car runs fine but when I floor it the engine sputters some and sometimes it runs fine. Could the 02 sensors be causing this and not giving me a SES light? Any suggestions would be appreciated.

I would recommend scanning the computer first to see if any fault codes are present.

o2s do not control anything at WOT. How much water did you get in it? How did it get in there. When is last time you had maf cleaned? Pull a couple of plugs see what they look like.