Mine runs at about 1000 rpms for a short while when its cold, then after 5 mins. or so it returns to 700. Does yours return to 'normal' after a while?

If you have a dud temperature sensor it might cause a high idle.

When did you last change plugs/cap/rotor?

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1991 300 SEL
218,000 Km

"Xsbank's rules of mechanical intervention: Always go for the easiest solution first; 90% of what ails a gasoline engine is ignition; After that its all a WAG."