[Vwdiesel] Cold starting procedure?

[Joe]

I've been meaning to ask another question and always forget.  My 82 Rabbit
n/a is nearly impossible to start at anything under 40 degrees (F) without
using the block heater... But I find I must also depress the throttle
significantly (like an inch) as well as have the advance pulled out and the
block heater cooking for at least an hour.  Nice big cloud appears behind me
and lasts maybe 10 to 15 seconds.  Won't idle well for at least a minute or
two without gently stepping on the throttle.  (I don't floor it)  Is this a
sign of one or more glow plugs being out or clogged injectors or both?  It
purrs like a kitten once warm and still gets 42-45 MPG at 70 MPH.

Thanks,

Joe