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IT SOUNDS LIKE THE THROTEL CABLE. HAVE SOMEONE SMASH THE GAS PEDAL WILE YOU LOOK UNDER THE HOOD WHERE YOU WAS WORKING YOU SHOULD SEE IT MOVING. IT SNAPS BACK ON THEY MIGHT HAVE A COVER ON THE END THAT SLIDES BACK BEFOR SNAPING IT BACK ON
IGNITION TIMING IS 13 - 17 DEGREES BTDC AT 650 - 750 RPMS. YOU NEED A TIMING LIGHT.TO SET TIMING FIRST CHECK FOR ANY TROUBLES.MAKE SURE YOU HAVE NO CODES. NOW TO SET TIMING.APPLY PARKING BRAKE AND BE SURE THAT THE CAR IS IN PARK.START AND RUN ENGINE UNTIL IT GET OPERATING TEMPERATURE.RUN THE ENGINE ABOUT 2000 RPM FOR 2 MINUTES UNDER NO LOAD,TURN OFF ALL ELECTRICAL LOADS, DISCONNECT THE THROTTLE POSITION SENSOR ELECTRICAL CONNECTOR,BE SURE THE ENGINE SPEED IS 700 - 800 RPM. REV THE ENGINE 2 OR 3 TIMES TO 2000 - 3000 RPM AND RETURN THE ENGINE TO IDLE SPEED.CONNECT A TIMING LIGHT TO THE NUMBER 1 CYLINDER SPARK PLUG WIRE AT THE DISTRIBUTOR END AND CHECK THE IGNITION TIMING BE SURE THAT THE TIMING POINTER IS POINTING TO THE 15 BTDC MARK ON THE CRANKSHAFT PULLEY,EACH NOTCH ON THE CRANKSHAFT PULLEY REPRESENT 5 DEGREES. IF THE TIMING IS NOT WITH IN THE SPECIFICATION, LOOSEN THE DISTRIBUTOR MOUNTING BOLT AND ADJUST THE DISTRIBUTOR UNTIL THE TIMING IS AT PROPER SPECIFICATION. TIGHTEN THE DISTRIBUTOR MOUNTING BOLT TO 10 - 12 FT LBS,STOP THE ENGINE AND CONNECT THE THROTTLE POSITION SENSOR.
these are notorious for this problem-a leaking intake gasket at #4-it can be verified by using a can of carb cleaner. Spray around #4 intake port, if the idle changes you have the same issue. Do NOT clean the throttle body on these cars, it is so sensitive that a 25 RPM change will set another code that you'll never get rid of unless you replace the entire throttle body. I work on my neighbor's Altima, there are no shortage of quirks with these cars. Here is a link specific to your issue, with owners who want a class action against Nissan:
You could have a clogged fuel filter, if you haven't changed it in awhile. You could have a leak in the intake system somwhere also. When you slow down, you get less power to the engine. It may need spark plugs and wires as well, if in need for a tune up.
bank 1 refers to the side of the engine that #1 cylinder is on , and sensor 2 refers to downstream , after the catalytic converter. , this link shows bank 1 on a 2001 nissan maxima V6 being on the firewall side . if you had a 4 cylinder it would be downstream after the catalytic converter . http://www.autozone.com/N,26200242/shopping/specsSelect.htm
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