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My '03 has started "surging" while on cruise and going down mild grades on the interstate. This happens regardless of speed (65 to 75mph) and regardless of the grade. It also occasionally happens on flat roads as well. Does anybody have any ideas on this? Truck has 88,000 miles, and is stock.

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My '03 has started "surging" while on cruise and going down mild grades on the interstate. This happens regardless of speed (65 to 75mph) and regardless of the grade. It also occasionally happens on flat roads as well. Does anybody have any ideas on this? Truck has 88,000 miles, and is stock.

Thanks!
Check to make sure software reflashes are up to date from dealer.
If that has been done, hook a tech 2 up to it and check pump output while taking tech for a drive. FRPCV (Fuel Rail Pressure Control Valve) might be having some issues.
 
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