Man i'm having the exact same problem, pretty much to the letter. I stall up the auto and as soon as you drop the load off the car dies. I thought it might be the boost leaking, sucking all the air out of the intake but with it blocked off, the engine still dies.
Hi idle (3000rpm) drop off to idle with no load its ok, but under load back to idle it stalls. I can see the ISCV is doing its job, changed the BOV with a known good 1. Still no change. The engine idles fine, just dies when the load is drop off.
Did you ever fix your problem?
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