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90Q idle hunting (fwd)

I wonder anyone has experienced idle hunting problem with 1990 20V 90Q !
My 90Q hunts at idle (mainly when engine is cool).  One dealer suggested 
that's the way they are - referring to all 1990 models.  Another one 
suggested giving the idle valve a "bang", or taking the idle valve apart 
and lubricate it.  Is this a user friendly operation ?

Solomon Ngan  1990 90Q 20V
              1984 5000S