Your throttle cable, needs to be adjusted.
The fast idle-speed on a 1994 Nissan D21 pickup is adjusted by turning the screw on the side of the throttle body. It increases the speed of the engine when the vehicle is idle before completely warming up.
One reason why your 1994 Nissan Altima could be sputtering at an idle is because of your spark plugs. It could also be caused by the idle sensor.
I dont have the answer, but my 92 does the same thing
Trouble code P0505 means: Idle Air Control System
NISSAN SENTRA'S AND OTHER NISSAN MODELS COME WITH A CHAIN. THEY ARE REPLACED WHEN THEY FAIL. TAKE NOTE:IF THEY FAIL.. HOPE YOU ARE AT IDLE WHEN IT DOES.. OTHERWISE IT MAY COST AN ENTIRE NEW CYLINDER HEAD.
May be computer controlled and not adjustable
Your idle reglator needs to be adjusted so it idles at a higher rpm
its located on the left side of your engine on the top just look up a picture of it then go from there
If it's the MK2 91 modl facelift. Cold 1000 rpm warm between 500 and 600 rpm
tps or idle speed motor
Your Nissan may just idle high during the warm up of your engine. These cars are designed to do this based upon the fact the cars have an optimum running temperature. If they idle high when for the first 15 minuets it's to achieve that optimum running temp. If not then you may have a vacuum leak.