My Car at start up revs past 2000 rpm when cold

1989 ACURA LEGEND
290,000 MILES
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FATCHROME
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Car at start up with cold motor revs it's guts out to past 2000rpm and then drops back to under 1000rpm after about 5 minutes of waiting. Whats causing this? Also I have noticed my car being AT. I have hardly any power pulling off a standing start while D is selected on the gear shift. The power just lags and car is struggling to get up past 100km/h in Drive. If I select S on the gear shift the power seems to return but even then is not at it's optimum. My cars gone from being a rocket to an old snail.
I would appreciate all your help.

Kind Regards
Hamish
Dec 17, 2011 at 9:10 PM
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RASMATAZ
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Clean out the idle air control valve and see what happens-also check the cold start injector if it has one-
Dec 17, 2011 at 9:15 PM