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I can't recall off the top of my head if it should or not, but if it's missing, then it absolutely cannot be a cause of your high idle!
The purpose of a dashpot is purely to slow the closing of the throttle plate, to help clean up emissions. It acts like a shock absorber. When you open the throttle, the dashpot plunger extends, but it's not touching anything. When you lift off the throttle rapidly, a tab on the throttle arm contacts the end of the dashpot's plunger. When the dashpot is working correctly, this causes the last few degrees of throttle closing to go more slowly, and reduces certain emissions. Dashpots pretty much have three modes: working properly, failed extended (this will cause the throttle to never close, and could contribute to a high idle), or failed limp, where it provides no slowing of the throttle closure, which would be the same thing as if it were missing.
If I recall (and it's been a while since I worked on an 8V... time to shake out the cobwebs!) idle on a CIS 8v 900 is adjusted by the idle adjustment screw that is on the top of the throttle body, perpendicular to the airflow, and some models do have a stop screw to adjust the closed position of the throttle plate. Bentley should have the right procedure for that.
Another thing to look at is the Auxiliary Air Valve. This is located on the inlet manifold, near the head. It has one electrical connection, and two hoses coming off of it, one on each end. This provides a small amount of additional air around the throttle plate during warm-up. The electrical connection provides 12 volts to a heating element, that closes the valve as the motor continues running. If the valve isn't closing as the motor gets warm, this valve needs to be replaced. It's located on the head, so that even if the electrical bit fails, it should still close, but often, they still fail open.
Of course, with a 1986 8V car, you've got a lot of expensive and complicated relays and switches all contributing to helping that motor still produce clean air when it's warming up. All of that needs to be tested, too, to be sure something isn't sticking there, causing a problem elsewhere.
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