High cold idle, surging warm idle

Thank you for the response. I could not locate the idle air screw, but I did clean out the throttle body around the butterfly. One thing I noticed, there is a film of engine oil in the intake. It seems engine oil is being pulled into the intake through one of the hoses. Any thoughts on this?

The problem still stands. It seems to me like some kind of massive vacuum leak/problem to me, by the way it acts. Could this be an EGR problem?

Here is a picture of the intake. Is the idle air screw the flush slotted head on the left of the intake, just above the hose clamp screw? Thank you again for helping

When I buy Toyota for six hundred dollars, the reason why because engine went stop when engine getting warming. So I look at forum I found answer, it said turn adjust on flat screw to half turn on throttle. Finally engine still running without stopping it worked. Thanks, seem this truck is worth four thousand dollar because look great condition and next time in future when I got problem then I will come back to this forum.

So after searching online for this problem this was my answer to my similar problem. Towards the rear of the engine compartment there is a gold colored valve that has some letters and vacuum hoses coming off it. There was one hose that was disconnected and I found that the idle adjusting screw was backed out completely (this screw is on the left side of the throttle body before the intake manifold). I screwed that back in and adjusted the idle accordingly. All fixed.
What was happening: I had an abnormal high idle when cold then as the temp come up to normal the idle would fluctuate up and down when the brake was depressed. This action of sporadic idling is caused from the ECM detecting this high idle condition and trying to compensate with the auto lower idle circuit that kicks in when you depress the brake. I hope this helps as it resolved my problem without replacing any parts. Thanks to all that have posted information for this problem it sure helped.