Re: 2000 6.0L runs rough and stumbles
Im guessing no check engine light? Like posted before the MAF can go bad and not set a light. EGR valve stuck part way open, Vacuum leaks, TPS sensor with a dead spot. If you do have bosch plugs throw them away there junk. Ive always ran NGK V-power plugs there cheap and a good plug never had a problem.
have you checked fuel pressure? Key on engine off 55-62 PSI.
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