Happens only when engine is up to temp

Fluctuation between ~600 and 1500

rev to 1500 and die till it hits 600 then back up and so on

Ideas?

when I start it I get a nice smooth 1500 idle and as it warms up to temp it drops back down to 900 and as soon as it hits the 750-800 range it starts doing crazy ****

Thanks in advance... I hope someone has something

 

check the IACV and the FIV, the FIV is under the throttle body and make sure the screw is tight... thats wut fixed my problem

 

I'll give it a whirl when I get the car back into the shop... we got a bunk tranny anyway so I know ill have to work on it some more