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International Automotive Technicians Network
Re: 6.4L Part Time Runs Bad
Posted to HD/Fleet Forum on 7/22/2020

Could air be getting in on the supply side? Balloon test being on the return, perhaps it might not show up there.

Seems to me if it were electrical it would set more or different codes. It does run poorly indicating something is making it misfire (and random... Login to read more.