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Hello and welcome,
Double check to make sure the throttle body gasket is installed. If it is disconnect the battery fro a minute and drive it around for a few minutes and see if the idle goes back to normal. Make sure the idle air control valve vacuum hose is connected, it's the one in the middle, the other two are for coolant and also check that the electrical connector is on.
Thanks for the reply,
Earlier you mentioned something about the egr valve, did o you ust remove and put it back on? A stuck egr valve won't cause the idle increase it would actually make the engine stall. A couple of other things to check but I have a quick question first: Does this engine have the twin throttle body? If so, take a look to make sure the both throttle plates close all the way then the other thing is that it's possible that for some reason the idle air control valve is partially stuck open or, and this is also very important, check the engine coolant temp sensor connector, check that the engine comes up to correct temperature the way it should at about 1/2 way on the gauge.
Maybe, it's obviously not the way it's supposed to be, not sure by what you mean egr solenoid nipple, is it the egr vacuum switching valve? Can you upload a picture of this?
That's not the egr valve solenoid, it's for emission control Evap system) If the thermostat is stuck open the engine will take a long time to get to operating temperature so yes it can cause the fast idle because the temp sensor is seeing it as such and sends the information to the computer which controls the idle air control valve. Eventually the engine should heat up even with no thermostat. If you remove the throttle body again then check the idle air control valve, remove it from the throttle body and check to see if it's stuck open.
I haven't yet asked this but is the check engine light staying on when driving?
Sounds good, let me know when you get the idle control valve off and send a picture of the inside of the valve. If you have any doubt about the thermostat go ahead and replace it. make sure both throttle plates close all the way