Hi,
  Are the waterboxers prone to intake icing?  Both my 85 digijet and 87
digfiant have been acting up when cold (less than 25f).  It starts and
drives nicely for a short time, then it bucks, hesitates,and the idle goes
anywhere from 600 to 2000 +.  It may do that a few times, or just a couple,
then it may not do it again that trip, or it may continue. The temps 2
sensors are ok.  I checked the aux air regulator on the 85 and the idle
stab. valve on the digfiant.  I just started using fuel deicer, but the
temps here are usually not constant enough for a good test.( although this
week it should stay could)  It seems to be an intermittent problem that
leaves my wife scared to drive it. (our daily driver too!)  Any ideas would
be a big help.

Thanks,
Larry