95 S320 RPM Surge on Start

This is something that just started recently.

My 95 S320 now accelerates when first starting in the morning or after
it's been sitting over 6 hours or so. When I start it the RPM surges
to 1500-2000 (for just a second or two) and I hate that since I know
that cold starts account for a majority of engine wear.

Any ideas would be greatly appreciated,
Bob