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tirwin,
Did the PO say it was set rich because of the broken WUR ? Control pressure offsets the deflection of the air flow plate and low control pressure increases the amount of fuel to the injectors. When cold the pressure is low and you get a higher plate and more fuel for warm up. Your pressure never increases and it should be running too rich when warm as a result. Your cold running problem is probably caused by something else and after your replace the WUR, I would be checking the mixture at hot idle in case it was adjusted to compensate.
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Paul
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