89 VW Fox Differetial pressure regulator faulty??

picsarli

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My 89 Fox runs very badly when the engine is cold, and /or warming up, but runs ok but not great when it is hot. When I disconnect the electrical connector from the differential pressure regulator the problem goes away, both with a cold or hot engine. O2 sensor seems to be OK. What would cause these symptoms? Tried different regulator, no change in symptoms.
 
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