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I don't believe CIS is complicated enough to have a "limp home mode"
There are, however, several ignition and fuel delivery schemes the ECU goes through during warm up but this depends on the age of the system (got more complicated towards the end of production).
The number #1 problem(s) with CIS seems to be vacuum leaks (so start taping up joints with self amalgamating tape if you want a low investment in your fixes) and fuel leaks.
It could be (I can't be 100% sure because the inner workings of the EHA are still a bit of a mystery to me) that the EHA is positioned differently when the ECU believes the engine is warm enough => in this position it leaks - fuel pressure drops (which is very important in CIS systems) and that's why the performance is bad.
Replace what you know is not good - replace the leaking EHA. Do a WTB ad - post up the ID numbers on your existing EHA as well. Someone on the forum must have a bit for you.
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Be prepared for a fair amount of fiddling about with that adjustment screw - so get a multimeter that can read duty cycle - for when you fit a different EHA
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