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grimace
my 08 wagon was doing the same, would drive ok if i put the boot into it, but sitting around 2000 revs in 2nd, 3rd it would surge (traffic driving). also really nasty in low 4. tried all the cheap things, disconnect battery for 24 hrs, clean maf, change air and fuel filters. ended up pulling out TPS and cleaned it with maf spray ended up making it worse and threw some fault codes (low voltage on TPS). replaced TPS and all good now, very pricey but $610 from nissan. the sensor is in the accelerator peddle (fly by wire) have to replace the whole peddle assembly, 3 nuts and a cable connection clip. disconnect battery, replace TPS, connect battery an hour later. not sure if this was the right thing to do but it worked.
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