Car runs good when cold..Sluggish once warmned up

[notractiongst]

ok heres my problem .. at WOT when the car is cold it runs great..just like it should..then once it warms up.. it starts getting very sluggish anyone have an idea of what it could be?

 

[Quasimondo]

1. Never go WOT on a cold engine, even if it is running better when cold. It'll lead to increased engine wear.

2. Are you getting any Check Engine Light indicators? Check your oxygen sensors (front and rear) as well as your coolant temperature sensor.

 

[notractiongst]

Threw a Cel earlier tonight gonna check it tommorow.. i only go WOT once its halfway warmed up.. I know my rear o2 is bad but its been bad forever and i just started having this problem recently... front o2 is cycling and o2s dont matter for WOT anyway.. and Coolant temp sensor should be ok as its new and myfan kicks on when it should if that makes a difference