Quote:
Originally posted by Mysterytrain
Porsche got cute with the CIS system in the 80 sc one of those things is a decel valve. The 78/79 had a decel valve that was bell or pear shaped and sat behind the the throttle body..and was adjustable.
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So what does the upper decel valve do? It was not connected to vacuum when I purchased the car, so I hooked it up and the idle jumped to 3000k and stayed there. So I have it disconnected, but I think it's trying to tell me that something else is wrong.