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Sounds to me like a bad coolant temp sensor. Also I highly recommend the tectonics tuning chip for 16v digi swapsI've been reading through the thread. There is some awesome info here. However, my scenario hasn't quite come up fully here.
Did a 16v digi2 swap in my 92 jetta carat. Having a major cold start issue. Won't idle and stay running. Like a lot of people here I am not running an ISV. Still running a copot. Once its warmed up it seems to run quite a bit better. Still very hesitant though with the throttle response. Can tell im not getting the power I should be getting. ECU is chipped (cant remember the brand) took it apart once and don't remember. I bought the ECU that way. It does back fire occasionally. Really spits and sputters on initial start up and driving until it clears itself out so to speak. Replaced fuel filter recently. Set the copot with multimeter. I am running the blue cts. Not sure if that's my problem or not. maybe its bad idk. Ive read a lot on here about the ISV and issues everyone has had with it. so that could be the culprit too. running scirocco intake and TB. Also not getting a temp reading on the dash. Hopefully ive given enough info to get some advice back. Thanks in advance.