Have a 1992 maxima and it stalls while driving in freeway or city streets then may not start after that what could be wrong?

There could be several reasons why your 1992 Maxima stalls while driving and may not start afterwards. Here are a few possible causes to consider:

1. Fuel System Issues:

- Clogged fuel filter: A dirty or clogged fuel filter can restrict the flow of fuel to the engine, causing it to stall.

- Faulty fuel pump: A failing fuel pump may not be able to deliver enough fuel to the engine, leading to stalling.

- Fuel pressure regulator: A faulty fuel pressure regulator can cause incorrect fuel pressure, affecting engine performance and causing stalling.

2. Ignition System Problems:

- Distributor cap and rotor: Worn-out or damaged distributor cap and rotor can disrupt the ignition timing and cause stalling.

- Ignition coil: A faulty ignition coil may not provide enough voltage to the spark plugs, leading to misfires and stalling.

- Spark plugs and wires: Worn-out or damaged spark plugs and spark plug wires can cause ignition problems and contribute to stalling.

3. Air Intake System Issues:

- Clogged air filter: A dirty or clogged air filter can restrict airflow to the engine, affecting combustion and causing stalling.

- Faulty mass air flow (MAF) sensor: A malfunctioning MAF sensor can provide incorrect air-fuel mixture information to the engine, leading to stalling.

4. Engine Control Module (ECM) Issues:

- Faulty ECM: The ECM is the brain of the car's engine management system and controls various functions. A malfunctioning ECM can cause stalling and other engine problems.

5. Idle Air Control (IAC) Valve:

- A faulty IAC valve can disrupt the engine's idle speed and cause stalling, especially when coming to a stop or idling.

6. Throttle Position Sensor (TPS):

- A malfunctioning TPS can provide incorrect throttle position information to the ECM, affecting engine performance and causing stalling.

7. Vacuum Leaks:

- Vacuum leaks can cause a lean air-fuel mixture, leading to stalling and performance issues.

8. Fuel Injectors:

- Dirty or faulty fuel injectors can cause improper fuel delivery, leading to stalling.

It's important to have your vehicle diagnosed by a qualified mechanic or technician to accurately identify the root cause of the stalling issue and have it repaired accordingly.