Idles a little rougher when cold now
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Not at the normal 7-800rpm level - bad idea. That's why the newer electronically controlled common rail engines automatically push cold idle to 1000rpm when the temp sensors detect ambient temp below a certain level. If you do not have any way to do that, than then the best approach to cold starts is to sit there with your foot on the throttle holding it above 1000rpm and/or drive away slowly soon as it smooths out within the first minute or so.
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