[Murph]

The flight modeling in Il2 will do that with most planes- this is called torque and actually occurs in the real world. To determine whether this is what is causing it, try flying a jet or a twin engine plane with counter rotating props such as the P-38. These should not pull to the left. If they do, make sure your joystick is properly calibrated. You don't say which joystick you are using- some have calibration programs which will tell you if the signal from the stick is "spiking" which could mean you have a bad potentiometer in the stick or perhaps just a loose wire.