[C320-list] throttle walk

[John Scott]

I just had a recent survey on my "new" 1993 320.  The surveyor  
reported that she had "throttle walk".  That is, the throttle wanted  
to seek low speed and walked its way from full on to a lower speed  
without holding where it was set.  Has anyone had this problem?  The  
surveyor said that I should install a "cable drag clamp" on the  
throttle cable.  I've checked online and can't find this part.  Nor  
can I find any reference to it.  Any ideas?  Thanks, in advance, for  
your help.

John Scott