Nissan np200 8valve 1.6 doesn"t idle - 2004 Nissan Altima

Which sensor are change TPS or AIC?

things to test/check:
timing/ timing belt ( Step by step instructions Upper Timing Chain Tensioner Nissan Forum ),
IAC valve,
all spark plugs (that they are clean & firing),
increase your idle rev count 98 1 6L Start up idle and stalling issue Nissan Forum

The you need diagnostic time with a scanner to start
on the problem

Cam Sensors report cam movement to the pcm/ecu

Most VVT issues are from lack of oil changes & sludge
build up in cams & actuators

Check your valve cover gaskets, bet they are leaking and that is burning off.

Engine stalls cold or RPM fluctuates at idle up and down or dies near idle.

This problem is commonly caused by a dirty automatic idle speed control valve and throttle valve but always run a OBD2 fault code as well as the cleaning procedure. Buy a can of throttle valve cleaner (do not use carburetor spray cleaner!) from NAPA or Carquest (made by CRC chemicals) and spray it into the air intake while the engine is running, use up about 1/2 the can, engine will try to stall hold the speed up, shut it down and let it soak for 30 minutes, restart and blow out the remaining fluid, shut it down and disconnect the negative battery cable for 5 Min's to reset the base idle control. If the above cleaning doesn't cure your issues you need to have the computer controlled automatic idle speed control system diagnosed and repaired by a dealer or electronic engine control repair shop.

check whether you might have a catalyst problem,1. doesn't idle as no emissions let out of the exhaust system,2. doesn't accelerate as the engine is pressurized as no released emission. Try to check by requesting somebody to accelerate as steady and you check through the end of your exhaust pipe if the emission outlet sound is loud enough or if is like weak sound.if is the second result surely your cat is the problem as also you receive a smell of a rotten egg as well.

My best guess is gonna be a vaccum leak... pick up a cheap can of carb cleaner. Start your car and listen for a whistle or something close. it will probly be near or behind the throttle body. take your carb cleaner and spray it with out the little red hose around the back coner on the driver side of the motor. you can visually inspect the area after you hear an increase the idle. if you dont find it there spray all around any where you see a hose. Hope it helps. a vaccum leak usually wont set a check engine light on OBD 1 cars. Good luck.

Problems with Nissan 2005 Altima include-Crank shaft position sensor with ECU reset, ECU Factory reset from Dealer, Low Fuel pressure requiring fuel pump replacement, Replacement of ignition coils causing misfire during start-Catalytic Converter Recall-Oxygen sensor on exhaust-Leaking Valve cover gasket-Radiator failure due to plastic top & Bottom (Constantly adding water to reservoir?)

you could try raising the idle. if that doesn't work you could change your fuel filter.