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surging 98 expedition

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Old Jul 20, 2013 | 09:32 PM
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surging 98 expedition

have a 98 with 350 motor and the bigger tranny, i just got it, when it warms up it starts to surge, rpm gauge goes up . but the power does not. i ran a scan and replaced 2 of the co2 sensors . it seemed to help i thing. but still does it. its been real hot here in omaha ne. i undid the gas cap and it deff was vapor locking. but still did it when i left cap off . any idea out there ,
 
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Old Jul 21, 2013 | 03:45 AM
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You have either a 5.4L or a 4.6L motor.

The surging is likely due to a vacuum leak. Connect a vacuum gauge and see if you get a steady reading of 20-22 inches of vacuum.
 
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