Misfiring cylinders - 3 & 5

I have a 2001 VR6 Jetta. A while ago the 'check engine' light came on, I took it in and the trouble codes that came back meant: misfiring cylinders, cylinder 3 and cylinder 5. We replaced the spark plugs, spark plug wires, engine coil and then replaced the camshaft position sensor.After replacing the camshaft position sensor we recieved improvement on how the car was running (and didnt backfire anymore) but the car still runs badly. What is my next step to take?
Please input any ideas or concerns!! thank you