Check for a sticking or dirty throttle plate, and the IAC or the Idle air control valve.
If the 1997 Nissan Altima with an automatic transmission is shifting gears too early, it could be that the shift solenoid for the transmission is faulty. Both the shift solenoid and the speed sensor on the transmission should be checked.
It's a 4 speed front wheel drive transmission with electronic sensors for shifting.
Check the transmission fluid on the 1995 Nissan Altima. Bad fluid can cause the transmission to shift harder on parts that are more worn.
The Nissan stanza has a 4-speed auto transmission. It shifting is electronically-operated . The transmission computer box is located in the center console. It is next to the ECM box.
The shifter linkage might be jammed or disconnected. The shifting sensor, that detects if the brake is engaged, may be malfunctioning.
Could possibly be shifting gears sporadically or your driving on hilly terrain.
check vacuum lines top passenger side rear of engine
Rev match better, your synchros are worn out. Your transmission needs a rebuild.
On the Nissan 240SX the electric overdrive switch is located on the right side of the transmission. Overdrive allows shifting into the auto's fourth gear.
Have you checked the fluid level? Have you changed the filter and fluid as normal maintenance?
The transmission on the 1994 Nissan Pathfinder may need to have a fluid flush. Dirty fluid will cause the gears to shift hard when transitioning from place to place.
your foot on the gas pedal...but really specify what do you mean?