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I have the same problem with my 78 911 SC 3.0. But, I didn't have that problem until I adjusted the airflow sensor plate. The car would start up immediately and ramp up to 2000 rpms and then idle down to 1000 after it warmed up.
I was trying to lean out the fuel distributor and I adjusted the airflow sensor in the process. So, I would suggest doing a fine adjustment to it. Be careful and not adjust it too much because it can cause the engine to backfire. Use the Haynes manual as a starting point and adjust up or down to see if it corrects the problem.
Steve
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