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1993 subaru legacy rough idle- what could be causing it?

1. Engine Air Filter

2. Spark Plugs

3. Ignition Coil

4. Intake Manifold Gasket

5. PCV Valve

6. Fuel Injector/Fuel Filter/Fuel Pump

7. Idle Control Valve/ Throttle Control System (may need cleaning)

8 . Fuel pressure regulator

9. EGR valve needs servicing or replacement and/or bad vacuum hoses connected to and leading from EGR

10. Dirty throttle body

11. Coolant temperature sensor or faulty wiring connection in that location.

12. Faulty Crankshaft or Cam Position Sensor: