St205 Running Rich, Randomly does it Options

[96stgreendemon]

Wow its been awhile since i posted up here lol, anyways i have had the 3s installed for about 6-7 months now and besides a few little hickups its been great!
The problem i seem to be running into now though is the car has been acting rather strange lately, as in the car starts running stupid rich for no apparent reason, literally it will hit 10.1 on the wideband while cruising down the street doing 35 barley pressing on the throttle.

My thinking was that it could be my o2 sensor, but cash is tight ATM so i have not checked that out, I had to deal with something similar a few months back because i found a crack in my downpipe (fixed now) i just cant seem to figure out why its doing this. Any help would be awesome..... almost thinking about changing my plugs.... but they are only about 3-4k miles old.
mods are 3" DP to 3"Exhaust (non-Restrictive), AEM TRUBOOST, Bee-R Rev Limiter, Intake.... think thats it engine wise. Help Please?

[96stgreendemon]

Bring the thread back from the dead, car is still doing this and just replaced the TPS and o2 recently..... Help?