There is a squealing noise under the hood when starting

What is causing that irritating noise? ' DSMtuners

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It sounds like you have a problem with the AWU. Accelerator Working Unit, a fancy term for the gas petal. If it is not getting the proper voltage to the ECM it will default to a RPM like you are geting, 2000-2500 rpm. Find one from a junkyard and try it out. I would not shake anything that will just cause other issues.

possibility of CV joint but then you should get the same sound at low speeds also.

if you getting this sound only at 2000-2500 rpm may be over advance ignition timing

It could be a vacuum leak on the inlet manifold or pipes Start engine and allow it to idle, spray some wd 40 or similar around the inlet manifold & vacuum pipes, if you notice a change in engine speed when you spray you will have found the area of the leak

Use a mechanic's stethoscope to locate the culprit sqeal. Have a technician rev the engine, in order to produce the squeal. Lay the stethoscope tip utop the water pump, nearest the armature. Locate squeal in this fashion against the idler pulley(if applicable), the alternator, the air conditioner compressor, power steering pump (if applicable), the cam shafts (if applicable), and finally the crank. This will help isolate the location of the squeal.

What kind of noise? If it's like a squeal it is a lose belt. If it's more like a clunk it's the transmission shifting and you just happen to notice it more because of the higher RPM the motor is at with the AC on. Try getting the vehicle moving with out the AC on then turning it on after you are moving to see if you get the same sound. If it's a squeal you have a loose belt that needs replacement or tightening.

Look for cracked and gummy vacuum hoses. It's time to see if any are in this condition or disconnected entirely.

yes...your engine belt is little bit lose that's y its causing noise...and hope when u speed up..it will stop squealing ..right?? so just tight your engine belt little bit and it will solve your problem in a min...take care n have a safe journey...n also if it help...rate it plz

Could it be one of the belts is a little loose. Check it with the engine cold.
I hope this helps you.

I had the same problem on my 2006 Lucerne and it was the engine mount located on the front of the vehicle behind the radiator.