why does my 1992 nissan maxima run like a jalopy?

Question

theres no check engine light. its an automatic transmission. 170k miles.
when i start the car it starts idleing bad. when i start driving it
stutters when i accelerate but when i floor it the stutter disappears but when it shifts it pops into neutral and the rpms go way up until it catches the next gear. so basiacally, i would like to fix the bad idle, once the bad idles gone im sure the other problems will go away too.
i changed the fuel filter, all the spark plugs, all the spark plug wires. is it even worth me trying to fix it or would a shop be able to fix it? i dont want to pay 500 bucks to fix it because thats almost as much as i payd for it. thanks for the help.

Answer 1

set your car's base timing properly.

Answer 2

Could be a vacuum leak in the engines intake system.

With it idleing, listen for a sucking noise where a vacuum line may have come off the engine.

Could be EGR valve too.

Answer 3

properly the sensor detects how plenty air is flowing to regulate how plenty gasoline to push into the device. very very nearly like an oxygen or air/gasoline ratio sensor. it shouldnt die regardless of the undeniable fact that it is no longer good for mileage to disconnect it.