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So as i understand the engine runs good only when the RPM are low with the AC on the engine will stall .
But if you keep your foot on the accelerator you can keep the engine running .
Is the check engine light ON when the engine is running .
Okay good thank you ,this looks like a IAC control issue ,
When you are at idle and the rev's are at 700 and you switch on the A/C the rev's Should drop 50 -100 rpm then go back to 700
is it doing this or staying at 400-500.
With the A/C off and at idle 700rpm select "D" the rev's should drop and then go back to idle speed +/-50.
if it stays low check and replace the Idle control Valve .
FIRST check the throttle body is not gunked up with carbon build up a dirty throttle body will also do this