Throttle Position Sensor

[Animated Meat]

Hello,

 

I am new to the website, a new Subaru Owner, and could use some help.

 

I recently acquired an 87 GL. 5spd MT, 4WD Hi/LO, SPFI.

 

It was running rough, sputtering, cutting out, surging etc. Error codes of 21, 31, 34 and 42.

 

I replaced the coolant temp sensor...error 21 gone.

 

I tested the TPS..and it had two dead infinite ohm spots across B and C when opening/closing the throttle valve. Also, about 10K across B and D.

 

I removed it, pulled off the Plastic Cover, and was shocked at how much corrosion was inside. All green as can be and caked with white buildup. I could easily see the two areas where the fingers were not making contact as it rotated.

Cleaned as much Desert Dirt, Alkali Salt Buildup, and Corrosion from it as I could. (It spent a lot of its past in the Southwest Desert)
Used a Wooden Skewer wrapped in Emery Paper to try and clean the traces where the fingers contact..without touching or damaging the fingers.
Sprayed it off with Electronic Cleaner, and it is much improved...I can drive the car..still runs crappy and hesitates, also still get the 21 error code. Code 42 mostly gone.

I really would like to replace the unit..there are areas of corrosion that are beyond repair.
Parts stores want an incredible 400 dollars for these things, can't find one on ebay...nearest Salvage yard is 2hrs away and they dont have one anyway.

Is anyone aware of an alternative replacement?
Is there some affordable over the counter unit from a different vehicle?
Its the Hitachi SERA484 one with the Four Prongs.

 

Thanks much for reading this and any provided help.

[naru]

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