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Sounds like a vacuum leak based on the idle screw not having any effect. It lets air in/out of the idle circuit.
The timing could be off a tad but unless you know what he set it at, you'd be chasing your tail.
I would wait before doing anything until you talk to the tech. It's HIS problem, IMO.
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1981 911SC ROW SOLD - JULY 2015
Pacific Blue
Wayne
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