Where is the eletric idle on 2001 suburban - 2001 Chevrolet Suburban

when the A/C is on there is a solenoid that speeds up the engine for the required load of the compressor. You probably have a bad solenoid or miss adjusted solenoid

check the setting of the idle/mixture screws . Check for vacuum leak

Ticking sounds like a dry lifter, when was the last time you changed the oil and filter? Humming sounds like you need a tire rotation because of uneven tire wear.

Get a computer scan for trouble codes to see if that points you towards the problem. Possibly an engine sensor is not working right till it is warmed up. You might also check the idle air control for proper operation when cold.

replace the idle air control valve. located on the throtle body that is bolted to the intake. little round cylinder shaped with a wire and plug goin to it!

Generally a high idle like that is caused by a vacuum leak. Start checking your vacuum lines and your intake manifold for holes, cracks, or tears. If you can't see any, then get a can of ether, and with the engine running, spray all around where the intake meets the engine block, and all around your vacuum hoses under the hood. If the idle suddenly dips or rises, you have found your leak. Most of the time, it is just a cracked rubber line, or an intake gasket. If there is no leak found, your Idle Air Control valve may be sticking, that is normally located on the side of the intake where the throttle plate is located. Remove the 2 bolts holding it in and see if the valve and chamber are full of carbon. IACs are pretty cheap parts to replace. Let me know what you find and i'll try to hlpe you further. Good Luck

there are to eletrical components next to one another. The throttle position sensor and the idle control vavle. They are right where the air supply housing goes into the metal part of the air intake system. Right at the firewall the air intake line, a big rubber hose, attaches to the metal trhottle body. The bottom of the two is the idle control valve. It has an oblong electrical connection and uses a small "torgues" type male wrench to get the two screws out. Torgues is the star shaped screw, rather than a hex head of phillips head type screw.

sounds like you have 2 different issues on this one. the high idle concern..i have repaired many of these with the same concern. check for vacuum leaks first, if all is ok, then check the idle air control (iac) on the side of the throttle body. replacing the iac motor 99.9 percent always fixes this concern

when fuel pumps start going out they tend to make a whining noise before startup and while idling, also you might have a lose of power at lower rpms

what year is your suburban? Previous model did not have ECM software to cope with carbon build-up in the throttle body intake. First car will idle rough, then will stall intermittently. Good news is that a rag and a can of carb cleaner will remove the black carbon on both sides of the throttle gate, then car will run smoothly.
Throttle body located on top, front of engine, so very simple to access.