Idle Control unit

[The Balakrishnans]

I am looking for an idle control unit for my 1987 5kcstq.  The car is now idling at about 500 rpm, and it does not compensate when the A/C comes on.  

I learned from the dealer that the dealer price is about $ 425. Does anyone know where I might be able to find a cheaper or used unit ?  Thanks.

Chander
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