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Could be a blown diaphragm in the EGR valve, or maybe a plugged DPFE/transducer? (the box that feeds control vacuum to the EGR dome). Is your CEL on? The OBDII code will should help troubleshoot this.
G/luck
Joel
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2016 Subaru Forester 2.5i base CVT
2016 Nissan Quest SV
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