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Anyone have any ideas as to what would happen if this goes bad?
 

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Several things.

Rough idle.
Engine cranks normally but difficult to start.
High engine speed.
Engine stalls soon after starting.

You may get codes:
P0505; Idle Control System Malfunction
P050A; Cold Start Idle Air Control System Performance
P050B; Cold Start Ignition Timing Performance
P1603,P1605; Engine Stall History
P0101; Mass Air Flow Circuit Range / Performance Problem
P0136-P0139,P013A; Oxygen Sensor Circuit Malfunction (Bank 1 Sensor 2)
P0171,P0172; System Too Lean (Bank 1)
P0300-P0304; Random / Multiple Cylinder Misfire Detected

How to check if the valve is bad?

Install a clean hose to the PCV valve.
1. Blow air into the cylinder block side and check that air passes through easily. If the result is not as specified, replace the PCV valve.
2. Blow air into the intake manifold side and check that air passes through with difficulty. If the result is not as specified, replace the PCV valve.
 
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