Where is the Idle Control valve in a 1999 Olds Intrigue GX?

Could be tuneup items, or more likely idle air control valve is dirty.

Under car,usually mounted near or in front of gas tank

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Id try cleaning the idle air control or replacing it. Clean the MAF sensor with MAF cleaner. Seafoam the intake too. See what happens after that.

Hi,

not knowing the engine type fitted in your Olds, I suggest to check / clean or better replace the idle control valve - also check all hoses for leaks,

this should solve your problem.

If not, the ignition system should be checked for damage (wiring, plugs etc,)

You need to do some basic tests to eliminate or get closer to the issue. Possibilities: 1) Fuel delivery 2) Ignition signal lost temporarily 3) Engine air leak - causes rough slow idle/stalling. 4) Bad MASS air flow sensor. etc, etc.

unplug the torque converter clutch it will run fine without it and should cure your concerns

Follow the blower wires. I believe you should find a relay. I suggest testing it as well. Make sure it is good. Also make sure fuse is good and secure. Test your control switches and check all the vacuum lines and wiring

You don't clean them, you get a new one. Usually if it's the MAF, it'll start and die, start and die. If your's is stalling, it'll be the idle air control valve, or the fuel filter, or the idle control system, or a vacuum leak at the intake or vacuum hoses. Good luck.

The switch could be bad or needs to be cleaned.

crankcase sensor, located behind starter on 3.5