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Is it an ealy or late 944? The early cars don't use a cold start injector, not sure about the later ones. It sounds like a leaking injector. If it sits at work it only has 8 hours to leak, and probably not enough to cause the problem. When it sits overnight, it has about 16 hours to leak and cause the problem. If you have an injector pressure gauge, check it right after you shut it off, then check it first thing in the morning, and compare the readings.
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