I have recently turbocharged a 2.0L Nissan Primera. So far I have a MSD coil pack, Taylor plug wires, iridium plugs but no management as yet. Sometimes the cars starts to emit white smoke from the exhaust, and when it does this, I notice that the revvs increase to 3-4. The smoking stops or decreases when I put it on first gear and raise the clutch a little, to decrease the revvs. What can be the causes of this smoking?