Engine stumbling on mild acceleration

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It was understandable; what's confusing is how one can think that running a fuel filter 6.5 times the recommended mileage would not have an adverse affect.



Say what you will about those dummies at [fill-in the auto manufacturer you despise], but they have educated engineers and part of the job is to ensure some levels of reliability and customer satisfaction; hence replacement intervals.



Inspecting the fuel filter is an indication of, well, how much it filtered. To know which change (filter v plugs) fixed the problem, the two changes should be done independently, so that the effect can be observed. (I noted this above in a response to Canadiantrucker502 when I suggested to change the fuel filter first and then, if the problem remains, pursue other remedies.)



Considering the mileage of the parts, I suspect that there would be improvement with both filter and plugs replacement.



I agree with practice as Vic describes - replace "consumables" and wear parts on schedule, and perform scheduled maintenance. With the exception of a failed battery and that thermostat housing, none of my vehicles have failed me (and yes, I know there's an element of luck).



Anyway, it's good that you did get it fixed and can move on to that thermostat housing (speaking of educated engineers).
 
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