My 2001 Chevy Silverado when idling will idle way down, gas gaudge will fall to E and if I am driving really slow it will staul out

Robert, have vehicle scanned for diagnostic codes. Check for vacuum leaks and if you have not done recently give vehicle a complete tune up cap,rottor,wires,plugs,filter's,etc, including injector/throttle body cleaning. Check the attached links,instruction and guides, Good luck
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chevy has a really bad track record with ECU computer unit. may need reprograming or replacement

Back to the mechanic - sounds like either an IAC motor or TPS sensor is the problem, but also could be the throttle cable (sticking leaving the throttle not fully closed).

When your stopped, that is usually closed throttle. I'd want to check and clean anything that has to do with idle air system, where applicable.
Sometimes with fuel gages, I do testing by using a couple of resistors representing full and empty. If your gage reacts properly, the problem should be the sending unit in the gas tank.

You might be low on freon if not compressor going bad to see if your compressor is going on and off turn on a/c on max have some one hold gas peddle down around 1500 rpm or just at a small fast idleif compressor goes on and off recharge it most likely one or two cans will be enough

a bank 1 or a bank 2 generally means an 02 sensors bad. or you may simply have a faulty gas cap. i would try the gas cap 1st,make sure it's tight, the engine running for a few minutes,then cut engine off. then open gas cap,do you hear pressure [air] releasing from the fuel tank? ok if not that,then if bank 2 is really bad,your check engine light would be on. but if the idle control sensor is bad,no light would be on at all. and it[engine] would idle up and down.or would'nt idle at all,or would idle up and down,just like what you've described. good luck and thank you for choosing fixya.com and please let me know if i'ved assisted you!

Try cleaning the throttle body and the mass air flow sensor.Does your check engine light come on?

Here are some of the causes of surges, stalls at stops, slow idle speed, erratic idle speed, rough idle and engine hesitation (and other problems), it is in most cases the idle speed control air-bypass valve and or throttle valve and upper intake, these area's get full of gunk and combustion residue over the miles and cause idle issues (stalls, low idle) like yours, Get a can of intake cleaner from any local parts store, not carb spray, intake cleaner, it is made by a company called CRC, remove the air intake hose to the engine, hold the idle high so the engine won't stall, then spray the can of cleaner into the intake while keeping the engine running, use at least 1/2 the can, shut down the engine and disconnect the battery for 5 minutes, then restart and complete a number of mixed driving cycles, town, freeway, stop and go etc., after a few days the problem will go away as the system will relearn to the clean intake.

try cleaning your idle control valve, make sure you dont have any codes in your computer, if you do address those codesl

sounds like a map sensor. I hope that helps you out man.