04 Pacifica P0498 P0499 Codes On Uphill Acceleration?

05-02-2013, 04:35 PM
Getting alternating P0498 and P0499 Codes only on extended uphill acceleration (500ft). Have replaced NVLD Valve and Purge Silenoid but codes keep tripping ONLY on uphill accelerations. Cannot find vacumm leaks or wire shorts.
Any Evaporative Emissions Experts out there have an idea??? Help.:runaround:

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