Engine Loses Power When Cold

Greetings! My car has an intermittent problem, which is that when the engine is cold, under heavy acceleration with the air conditioning running, the engine will lose power and die. If I wait a few seconds then restart the engine. Everything is fine for the rest of the day. This is a 4AFE engine with California emissions.

In pursuit of fixing this problem I have replaced the following:

-Distributor, Spark plugs and Wires.
-Fuel pump, screen and fuel filter.
-Sub-diaphragm idle-up actuator.

My gut tells me the issue is somewhere in the vacuum system, perhaps a sticking valve switch (VSV) or maybe something with the EGR system.

Other than this annoying issue, the car runs great. I really want to get it sorted out for my peace of mind. Any input is appreciated! Thanks for reading.