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Re: '91 Blazer not starting when it's REALLY cold out.
some years back my dad had a 86 Blazer with 350 TBI in SD that had the same problem... after years of troubleshooting never did get it fixed... the only thing they figured was that the fuel pump was frozen enough to not pump anything. It only seemed to happen if the air temp dropped below -20... and since gas takes much colder temps to freeze, it was holding onto that temp which was transferring it tot he pump and freezing the parts...
this was just a theory though.
A block heater and a antifreeze heater never helped at these temperatures. Someone mentioned a gas tank heating blanket but I heard they are more trouble then it is worth...
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91 Chevy Suburban Tonawanda 454 R2500 - SOLD!!! 
04 Dodge Durango 5.7L Hemi 2WD, 24K miles (as of July 2011)
In the past 30 years about 90% of Fords are still on the road, the other 10% made it home.
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