i just rebuilt the motor and put it back in and cant find where this plug goes.

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this is the last thing i got before i can test run it. it is an 85 4x4 with the auto trans.
here is the motor before install

 

I believe that it connects to your auxillary air valve underneath the plenum.

 

you sir are my new hero. its now hooked up and doing final checks before start. thanks a ton.

 

No sweat. You should know that I cheated. I went out and looked at my 86 to find out where it was plugged in.