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Surging 99 v10 f250 4x4

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Old 07-20-2015, 01:45 PM
71f100s 71f100s is offline
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Surging 99 v10 f250 4x4

Running down the road at around 1500 rpms and about 35-45 mph when i let off to coast down like a hill or even flat road the truck starts surging from 1000-1200 rpm up to 1400-1700 rpms until i get back on the gas. Any ideas what is going on?
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Old 07-20-2015, 02:06 PM
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Long Haul Long Haul is offline
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Any surging at idle ?? My first thought would be vacuum leak somewhere..
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Old 07-20-2015, 04:34 PM
71f100s 71f100s is offline
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It dont do it constantly just started after i had the airbag fuse blow i replaced with proper amp fuse and now it surges when i let off the accelerator some times. Wouldnt vacuum be constantly surging?
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Old 07-20-2015, 04:36 PM
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And it use to surge after a long trip once i put it in park and sat idling it would surge sometimes it surge from 750-800rps to 1000rpms and fall back to 750 instantly
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Old 07-20-2015, 06:33 PM
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Idle Air Control valve? MAF sensor? Vacuum Leak? Throttle position sensor?
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Old 07-21-2015, 10:16 AM
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What i was thinking was throttle position sensor would it throw a code only code the is thrown atm is my emissions cause i had to take catilytic converter off
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