[Dorsh]

Thanks guys for the comments.

One thing to point - this issue existed before the replacing the air box and was noted when the car had a charging issue. Having said this one of my other cars (Dodge truck) had a bad battery and the truck idled very fast similar to this to compensate for the bad battery. Does my Porsche have a similar system?

The return spring and linkage are all good. I've replaced all bushings and springs associated with the throttle while apart and also confirmed this by running the car without the linkage connected. Is the throttle body returning to idle position? When apart the linkage would allow the valve to close so I'm assuming this isn't an issue.

I will look into the decel valve and idle screw. I agree the car was running very rich with the split air box. After one quick drive since back together it seemed to lean out so I'm not sure at this point. I will look into these items and report my findings.

Thanks again for taking the time to comment. I'm an ex AF jet mechanic so I know my way around a wrench and have two boys under two so taking this to a shop is not in my nature or an option.

Thanks again,
Kurt

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78SC