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First off try plugging it in for at least a few hours before you run it on cold mornings, as someone else said. Your injectors work from oil pressure, so it could just be that thick, cold oil is preventing it from firing right up.
Mine will start when cold if I don't run the block heater, but it is not happy about it. It clanks and smokes and feels like a cylinder is half-missing until it builds some heat up. Running the block heater though makes it start like summertime. I also get the feeling the extra cold noise is from tolerances between parts that don't tighten up until hot and probably some less than ideal lubrication with really cold oil, so that's probably extra wear and tear on the engine that can be avoided.
Def. get the inductive heat flash done (I will be having the dealer check my truck for it in a couple weeks) but if you have a block heater, use it!
Also try some fuel additive. Stanadyne seems to be the universally accepted best one (and I like it as well), but Power Service is fine too; they have a winter blend, white bottle I think. Stanadyne has a 'Performance Formula' that I generally use, but I understand they also have a winter additive if you think you need it. Since most pumps have anti-gel added in the winter anyway that may be redundant, so you can probably just stick with the Performance blend. It boosts Cetane among other things, and smooths out the engine along with helping cold starts. Also try a tank or two of B20, since it has a cleansing effect and might help your injectors out (just be aware that it also cleanses your tank and might knock deposits into the filters).
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