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does the check engine light ever come on when your driving ?
do you know if there are any codes in the computer at all ?
no to both questions
i replced the spark plug less than 30K miles ago ,nothing else has been done on the engine.
with the engine hesitating and the plugs are fairly new there are a few tests a shop must perform to eliminate a few things
right off the bat usually its as simple as cleaning the MAF with some MAF cleaner spray as they get dirty and sends a wrong air flow entering the engine signal to the computer and will not adjust the fuel correctly causing this problem
if that is not the problem fuel pressure mist be checked next and a compression test
its usually one of those 3 things causing the fuel mileage issues and the hesitation problem
with no codes in the computer that's the next step
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2003 Jetta left rear window blue plastic part of the