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assuming your talking about the transmission modulator...visually inspect the transmission and look for a vacuum hose from the engine to the tranny...
Idle Air Control Valve
Sorry, but that year did not have one. You must have another problem somewhere.
What engine???
No adjustment required. If you have a noisy valve train, parts are worn.
No.
The PCV valve is in the passenger side valve cover of the engine with a hose leading to the intake.
There is none.
Horn valve? Please give more info.
under the master cylinder.
If you have such a valve, it was installed as an aftermarket modification. Check with whoever installed it.
The ABS pump motor relay is not serviceable. It is part of the ABS modulator valve.