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But the fuel mixture is set correctly - in fact ever so slightly rich.
Richening the car up would only get around the problem, not solve it.
This afternoon I tested the air flow sensor potentiometer. It checked out - 0.4V at the specified (near rest) position, nice and smooth up to 5V throughout motion. Also removed ECU and checked continuity for wires to EHA, WOT/idle switch, and air intake temp sensor. I'll check the coolant temp sensor when cold but think it's correct.
So I am 90% certain everything electronic is working correctly.
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