Ok I cleaned egr new tps,new o2 sensors no vacuum leaks to b found and my idle still drops from 750 to 0 its a 96 Isuzu rodeo

Vacuum leak ? EGR valve stuck open ? Any codes set ? P0171 & P0174 lean codes ? Stuck lean O2 sensor ,do you have a scan tool that can view sensor data parameters ?

Vacuum leak , IAC valve - idle air control , Go to your tube an check out videos on checking for vacuum leaks an how to test IAC valve an cleaning throttle plate an IAC - air passages ! Eva codes ? what code # ?

have you checked the spark plugs if its a v6 the rear plugs may not have been changed

Did you check the airflow sensor? Clean it, maybe it will help

start to idle & spray aero start around whistleing sound to find leak. RPM will increase if leak found. repair leak. Also have the cam sensor replaced

That's a symptom of a vacuum leak or an air duct leak between the air filter box and throttle.

Did you replace the front O2 Sensors or sensor at 100,000 miles?

Checked coils how? No misfires? You need a professional
scan tool to see that

Do you have a timing belt,if you do, did it jump teeth?

Is the converter clogged

Test TPS Sensor for voltage,key on,eng off,back probe
5 to 0V one side ,0 to 5V other side?

Vacuum Leaks---anywhere including Evap System

No Codes Stored-not just check light codes,stored data?

check to see if you have a idle air control valve

these O2 sensors are cat convertor check sensors. id be checking cat convertors and hopefully you should try replacing if not all ready is the front bank 2, O2 sensor
if you have scanner can you see fuel trims in data display to confirm high fuel trim only on bank 2 either +-5 or more indicates problem and if bank 2 sensor 2 has fixed high 700mv reading cat no good(warm idling)

To me if the engine will not idel and stall once you have stopped, that points to an IAC (Idle Air Control sensor) which is located on your throttle body.  The part is very easy to get to and changes out pretty quickly.  Hope this helps.  Thanks for an honest rating and for using FixYa!