Rough Idle

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For some reason the system will not let me select the correct model I own a chevrolet corsica 95 2.2 L 4 I get Rough Idle when select Parking or Neutral Used to work fine after the tune up that I did a couple weeks ago, I put brand new wires, spark plugs, fuel filter and Ignition Coils, and also if I step on the gas the RPM goes crazy up and Down in Parking or neutral position, I double check the firing order and is OK please I need help thank U guys!!