hot injection pump. 1985 W126 300sd

[goldveg]

Hello Forum community. Hope someone can point me in the right direction.

I have a 1985 300sd.

The car runs Ok until it is hot.
When it gets hot then it idles very high.
If I push the throttle then it revs even higher and is very slow to rev down.
It even goes so far as to keep the throttle high when driving. Sorta like cruise control. But, the main characteristic is that it revs high when hot and it takes a long time to rev down.

It is a hard start when hot also.
When I first start the car in the morning it does NOT do this.
Is this from leaky injectors (at nozzle end), rack damper, blowby (piston rings worn).
Help me!!!!!

Thanks goldveg
.