Radiator and Throttle Switch

[Keith Lawyer]

My '89 200 has an intermittent high idle (as high as
3k).  Per SJM's site I'm sure my thottle switch is bad
as I recently cleaned the ISV.  Anyway, when idling if
I tap the throttle, the tach first dips a little and
then climbs.  When I let off, the needle seems to fall
"roughly."  What would cause this?  Is it Throttle
Switch related or something else?
  Ok, I searched the archives for a source for
all-metal radiators as mine's now leaking.  I saw
suggestions for Imparts (doesn't appear to be listed
on audifans.com), PAP, and GPR.  Any other
recommendations?  Someone said you can buy Modine
radiators w/out the Modine name (CSF?) for much less? 
I'd really like to stay under $200 if at all possible.

Thanx,
Keith L.
'89 200

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