[Vwdiesel] Makes blue smoke when first starting engine in morning. Why?

[Sherwin Goff]

1982 VW diesel pickup.
   
  Why would the exhaust put out blue smoke and the engine be miss-firing when it is first started each day? After the engine is warm, during the day of re-starting, it makes no blue smoke and it does not miss-fire anymore.
   
  Please help me out if you have had this experience. It is not black smoke, it is blue and the engine miss fires when the engine is cold and first started.
   
  I had the injectors removed and each one checked for pressure and also tested for a good misty spray.
   
  What are the possible causes of blue smoke when first starting the engine in the mornings? 
   
  What would be causing this problem I am experiencing? Is it rings or can it be something else.
   
   
  I need your input.
   
  Thanks
   
  Sherwin