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2001 Maxima se replaced idle control valve last week ran fine then today cranked the old girl up and it just sit there and would run to about 2000 rpm and drop back to 1200 rpm this will go on forever up and down unplugged mass air flow sensor the idle dropped way back but was still eratic not as bad though plugged air flow sensor back up and started all over again all hoses seem fine could maf sensor be bad thx