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There are 2 temp sensors? One for the glow plugs and the one on the right block for the injector pump? The way you describe it below 40 degrees is exactly that. It fires, but immediately dies. It acts like it is working to build fuel pressure...as in bad check valve or weak fuel pump. If...

So...what's the best box to buy? Is there a way to test it? Also, here is a thought. If the box and glow plugs don't even last 500 miles, and the truck starts instantly without them above 40 degrees, and just a little slow when cold...then the question is, why not get rid of the glow plugs...

The glow plugs are less than a 500 miles old. Above 40 degrees is starts great. Below 40 degrees is takes a ton of cranking. It acts like an old gas car trying to get the fuel back in the bowls...and that's why I ask about a weak fuel pump. Is there a lift pump?

In warm weather and if the truck's been running in the last couple hours it cranks and starts instantly. If the air temperature is below 40 degrees and you are starting it for the first time of the day, I have to crank it for at least 30 seconds, getting several "bumps" before it finally takes...