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"Fires right up, no problem. Usually settles into the poor idle for a few minutes and then, like a flip of a switch, idles smooths out and the car runs perfect."
You mean from a cold start? If so, the DME ignores the O2 sensor for the first few minutes when warming up so that "flip of a switch" could be when it starts reading the signal and then tries to adjust the idle and mixture. So perhaps your base idle and/or base A/F mixture are too low, hence the rough idle and dying as you try to pull away. Hard to say though since you do not even know what RPM it's idling at, you really need to get that tach fixed. And if it is the mixture or idle that's off, why? There's a bunch of possibilities there, just because you remove the oïl cap and the idle drops but doesn't die does not necessarily mean that you do not have a vacuum leak, it just means you don't have a really bad one.
And yeah, a bad head temp sensor is a possibility too and is easy enough to check.
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