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Hi, I've just bought a 911sc cabriolet with a problem of high idle when hot. The car starts easily, idles roughly at 900 rpms and then as I drive for a while it settles in to a 2000 rpm idle that won't go away. If I stop the car for a short period of time and restart, the idle once again stumbles at 900 and then starts to creep up to 2000.
From what I've read on forums, there seems to be so many different places to start troubleshooting...any suggestions? acccumulator? WUR? simply adjust idle and fuel mixture?? crack in airbox? vacuum leak??
Any pushes in the right direction would be appreciated. The car has a very complete service history and I see where the WUR was changed with a second hand unit at one time and then a new unit replaced that one a few years later. When I received the car, I also noticed one of the electric plugs to the WUR, the one towards the back of the car, had been disconnected. I reconnected it.
Thanks in advance.
here's a pic of the car.