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on nissan's air vent controls, they use electronic servos already. this may entail that you havta dis assemble half of your dashboard. unless you're quite savvy in doing this and locate each servo in its separate locations in each air vent; i suggest that you bring it in to a shop.
i suspect you have a dirty mass air flow sensor. It is in the air cleaner assembly with 2 anti-tamper screws on it. remove the MAF sensor and clean with carburator cleaner and a toothbrush very gently. the wires are very fragile. The MAF tells the computer how much air is flowing through the air cleaner to adjust the fuel mixture.
other posibility is TP Sensor (throttle position).