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sounds like it needs tuning. when it warms up the IAT and CTS take or add fuel, you check the percentages in the software and you can zero them out for diagnosis purposes, or fix them so there is less or more as necessary.
Rough idle, then shutting off, sounds like its leaning out. the iat might be heat soaking and rising rapidly to portions of modifier where its taking massive amount of fuel out. You should be watching the wideband to confirm diagnosis. Dont tell me you don't have a wideband on a car with a standalone...
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