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Cannot figure it out. It's only at 1500rpm, nothing above or below. Any ideas? https://youtu.be/t_S_WRbiWPY

Just noticed this issue last week. On any sort of cold start there will be a small puff of white smoke, doesn't really smell like fuel but more like something burnt. If I shut the truck off and immediately start it again there is no smoke. Truck runs like an ape and haven't noticed any...