funy you say this becouse since my ideling my temp has been all over the place

so the sencer on top of the thermostat could be my ideling problem ?

becouse when its cold does not do it but soon ass it warms up starts playing up

could this sencer be broke and its telling my e c u my engine still cold so its putting more fuel threw causing it to idel all the time cos it is useing more petrole ?