2003 F250 Super duty 6.0 turbo diesel crew cab, 125k miles. Will jerk & hesitate
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It will act like it is running out of fuel or has bad fuel (will jerk and hesitate) but the RPMs never change. The turbo whistle will cut in and out. This happens on even terrain but is particularly bad on inclines... it is at its worse when starting out from a stop. Has been happening for many months so I'm sure it's not "bad" fuel since it's been refueled numerous times. The truck is not driven very often... it will sit sometimes for a week to ten days and when it is driven it's only for about 10 miles. A fuel preservative is used because a tank of diesel can sometimes last 3 months (due to the infrequent use). Please help.
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