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I don't know if this will help. Had a similar problem with a 99 Blazer.
Would drop to between 300 and 500 rpm at stop signs and red lights, would stall and shake.
Did all the same checks, replaced mass air flow sensor, replaced cam sensor, cleaned the fuel injectors but the problem was still there.
Replaced both #1 and #2 O2 sensors in the exhaust pipes and now the vehicle runs fine. The idle is back to a steady 750 rpm in all stopping conditions. The Mass air flow sensor and Cam position sensor get information from the O2 sensors.
IAC idler air control valve bumps up the RPM and doesnot let the engine to die, how ever if its not the IAC then Ide be looking at the TEMP sensor which migh have a fair line crack or may be the MAF mass air flow sensor might be bad, seems like the engine is not geting air, check the air filter first.
The problem is in the idle air control motor. It is mounted on the throttle body with two bolts, you can pull it off and make sure it is not caked with carbon also check where it mounts on the throttle body and make sure it is not caked with carbon.