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'87 TQW idle problem?



  Ever notice that when you own multiple vehicles that problems
  always come in batches......?    :(

  The '87 QTW has developed an idle stability problem. The idle
  is too high on starting the car when cold and then climbs to about 2KRPM
  and then drops to about 900 RPM, only to then slowly increase again to
  2KRPM and repeat the cycle. Boost operation is OK and the car runs
  very well otherwise. I checked the idle stabilization solenoid, it
  appears to
  be working OK and is clean. The problem persists exactly as before if
  the idle stabilizer is disconnected. Opening the oil filler cap
  immediately
  stalls the engine. No obvious holes/tears in turbo induction hoses.
  The 900 RPM-to-2KRP-back-to-900 RPM cycle takes about 3 seconds.
  A/C on or off makes no difference.

  Any ideas?

  -glen