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96 freightliner fl70 5.9 mech cummins p series pump, truck starts and runs good except when the temp outside is say below 40F in the morning it will start right up and idle a min or two and start to miss unless you hang in the throttle, its like its making air in the injection pump, only does it...

Got a 1996 fl70 few months back and put it to work, great running/driving truck for my needs, specs are 5.9 cummins mech.IP Allison 3060 6sp trans and 7:17 rear gear, I weigh around 24k loaded and i get 64 mph with eng, wound up tight, about 7.5 mpg i figure, i need advice on a ratio change to...