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Are you getting a check engine light now? Were you getting one in the past? A real misfire will cause the CEL to *blink* & a code scanner will tell you exactly which cylinder is misfiring. Under what circumstances / conditions does it stumble? Our 2002 will occasionally stumble very slightly when taking off from a COLD startup. It does it once, then that's it. I never persued it 'cause it runs like a top otherwise (29Kmi now) Mileage in the high teens is very typical. The absolute best our '02 can ever get is 18-20mpg, steady hyway driving. Same with the 2003 in our family. For a stumble on every cold take-off, I would suspect a bad intake manifold gasket. Bad IMG's are real common.
G/luck
Joel
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2016 Subaru Forester 2.5i base CVT
2016 Nissan Quest SV
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