Ask you mechanic if he measured control pressures with the engine running during the cold start process. You get different numbers with the engine running and with it not running, because the WUR has vacuum connections. Also ask him if he checked the proper operation of the vacuum thermovalve (small plastic disc located under the heater blower motor). If it's stuck closed, your mixture will be too rich. It is supposed to be closed on cold start and then opens up after a short time.
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Bill Krause
'79 911SC Euro
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