Q: Why truck will not go when cold

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The truck runs fine after it warms up got a injector going bad and thought that was the problem but not sure now before and by that i mean a couple of months back the truck would run rough skipping and cutting out for 4 or 5 miles only when it was cold as in set overnight i could drive it to work and it was fine at the end of the day still ran as if it were warm already but now the thing will only do 30 mph untill it warms up and in a couple of hours it is like it set overnight again but after the 4 or5 miles it takes to warm it up it runs like a new one again it is so weak if you park on the slightest hill you will need four low to get it to back up but like i said it runs good as new after it warms up.and it also doesn't won't to start only after it sets overnight and it has new set of glow plugs

My car has 290000 miles.
My car has an automatic transmission.

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