can anyone tell me what to check when idle rpm goes from 700 cold to 900 or so hot ( 80 deg.C) been doing it for awhile . Thanks for any help. bubba

do you mean it idles around 700 when its started up and when you come in to part the car its idling around 1000?

have your linkages been lubricated in recent history? IE in the last decade?

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Proud owner of ....
1971 280SE W108
1979 300SD W116
1983 300D W123
1975 Ironhead Sportster chopper
1987 GMC 3/4 ton 4X4 Diesel
1989 Honda Civic (Heavily modified)
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lub'd all the linkages and checked length against shop manual about 6-7 months ago. at the time it improved throttle pedal movement(easier) still had variation in cold/hot idle. thanks for assist.

Mine does same thing but mine surges when cold but once warm idles fine could this be the rack damper bolt?

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I don't know about rack dampner, I thoght that was for vibration ( provided e ng. mounts & shocks are good) the hot idle hangs at 900 or so when stopped at light, sign etc. that's after decel down from road speeds.