Quadrajet, high idle with warm engine

[kikkegek]

I have an annoying problem.

Whe my engine is cold, no problems It idles nicely at about 500-700rpm. And the throttle return nicely all the way.

But after some driving and the engine warmed up, the throttle does not fully return to the idle position all the way by itself. I need to pull the pedal up by hand or foot or need to kick the throttle once...only then with a warm engine it will rev down from the 1000-1100 rpm to 500-700...

I already checked if it is the cable, unhooked it and tested by hand...slowly releasing the throttle linkage and quickly releasing the throttle linkage...when I release it slowly...it will not return for about I think only 1-2 mm....wich is only a lttle...but causing the annoyingly high wining of the engine....

and only when the engine is warmed up ....please help

btw..its a Rochester Quadrajet


some pics to help and the serial to identify...

any ideas why it idles high when warmed up?