Yeah I've erased it and it keeps coming back

I changed the ignition coils and wires but still nothing.
Then I bought original Volvo spark plugs and the misfiring stopped.
I had used Champion Iridium plugs before and they were about 2 months old. I took them out and saw that there were deposits pretty far up the thread. Is this normal? Does ...

My 2000 Volvo S40 1.9T is showing the following error codes:

P0017 Crankshaft Position - Camshaft Position Correlation (Bank 1 Sensor B)
P0301 Cylinder 1 Misfire Detected
P0302 Cylinder 2 Misfire Detected
P0303 Cylinder 3 Misfire Detected
P0304 Cylinder 4 Misfire Detected

When I start the car and ...