plasma flicker (2/6/09): Flicker in plasma upon ignition, not stabilizing-due to moisture bubble in the glass tubing between the torch and the nebulizer due to worn pump line.  Replaced pump and waste line and dried out the glass tubing with air.  Reflushed and ignited. Watched for proper drainage and plasma stabiliztion.

Acid pump: If the pump is running but no acid is being moved through the tube, the tube may be worn out. Try replacing it.