saab 9000cse engine constantly revs whilst in idle?

Saab 9000cse engine constanty revs up and back down between 1100 and 1900 revs when idling. Car has covered 107,000 miles N reg. Starts up ok, drives ok. Any help appreciated.
IC, December 2007


done
usually my saab will do this if the fuel is of a lower quality use 98% octane and that should fix it you can also add some boost or valve cleaner to the fuel and only use premium fuel in future.

oliver, February 2008
usually my saab will do this if the fuel is of a lower quality use 98% octane and that should fix it you can also add some boost or valve cleaner to the fuel and only use premium fuel in future.

oliver, February 2008
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