The problem could be related to the tune up of the engine.. when the vehicle is traveling uphill there is more load on the engine, so if the engine spark plugs arent up to par they will missfire causing the hesitation your feeling .. damp conditions could also contribute the the misfire condition .. i recommend having the tune up parts checked and replaced as necessary.
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I take my van in to just get oil changes air filters changes but that is about it.
I only have taken my van to get oil changes were the due he basics and have the air filters changed but that is ablut it.
when was the last time you had the tune up parts checked/ replaced?
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