I replace fuel filter and mass airflow sensor car still stalls out after gyou turn it over

There are several potential causes for a car stalling at low RPMs in gear, and a vacuum hose problem is one possibility. Here are some other things to consider:

Fuel delivery issue: If the car is not getting enough fuel, it may stall at low RPMs. This could be due to a faulty fuel pump, a clogged fuel filter, or a problem with the fuel pressure regulator.

Ignition problem: If the car is not receiving sufficient spark at the spark plugs, it may stall at low RPMs. This could be caused by a faulty ignition system, such as a failing ignition coil or a damaged spark plug wire.

Clogged air filter: If the air filter is clogged, it can restrict the flow of air to the engine, which can cause the car to stall at low RPMs.

Throttle body issue: If the throttle body is dirty or malfunctioning, it can cause the car to stall at low RPMs.

Mass airflow sensor problem: The mass airflow sensor measures the amount of air entering the engine and sends this information to the engine control unit (ECU). If the sensor is not working properly, it can cause the car to stall at low RPMs.

To determine the cause of the problem, you may need to have the car inspected by a mechanic. They will be able to diagnose the issue and recommend the appropriate repair. In the case of a vacuum hose problem, the mechanic will check for any leaks or damage to the hose and replace it if necessary.

Check your mass air flow sensor and all vacuum hoses for leaks, your mass air flow sensor is located somewhere on the intake hose between the air filter box and manifold. Maybe loose wires maybe bad airflow sensor, could just be dirty, could even be timing advance or other sensors. Read codes from computer and go from there but likely something simple.

Sounds like a lean fuel condition. If fuel pressure is good, I would suspect a dirty or faulty mass airflow sensor. Try disconnecting the sensor in the air intake tube near the air filter. If the problem goes away, replace the sensor.

First check fuel pressure to specification. My suggestion is a faulty mass airflow sensor. At idle lightly tap on mass airflow sensor with screwdriver handle and listen for erratic change in engine rpm. Wiggle airflow sensor connector and listen for any changes also. Replace sensor if rpm changes.

look for vacuum leaks

Replace first, the fuel filter if this has not already been done. You may have a plugged filter, and these are very inexpensive. If this does not resolve the issue, locate the MAS (mass airflow sensor) located between the throttle body and the air filter housing. Start the car and let it idle normally; with a screwdriver handle or other such small tool, tap the mass airflow sensor (small black unit; will have a wiring harness hooked to the side of it); if the car dies, stalls, hesitates; first purchase MAS cleaner at the local auto parts dealer - specifically ask for Mass Airlflow Sensor Cleaner. It will should cost between 7-12 bucks - but you wont need the whole can - however, when using it: (if the car does not die, stall or hesitate and the idle stays the same, than the sensor is not bad) If it does however:
1. Remove the MAS (disconnect wiring harness) you may need to pull the top end of the air filter housing off.
2. Spray inside the sensor generously from both ends ensuring it's entirety is sprayed. Let stand for 15 minutes to airdry.
3. Re-install the sensor and start car. If there is still no improvement and the car hesistates, 1. Ensure the air filter as well is in good repair, and that there is nothing causing any air flow restriction between the airfilter and the throttle body.
4. If the airfilter is good, and there are no restrictions to air flow, consider replacing the MAS, however if you can get the car to the auto parts dealer, or to a technician (who may charge; auto parts dealers usually don't) have them run a diagnostics test on the car.
5. At this point, if cleaning the sensor has made no improvement, and the car stays idling, does not hesitate when tapping the sensor, the air filter is good, the fuel filter is good - then the next step is to replace the fuel pump.
Please let me know if you need further assistance.
carsandcomps,

Check your EGR valve, check your PCV valve, check your mass airflow sensor and throttle body sensor.

Did you change the fuel filter? It could be clogged.

You may want to check the fuel pump or the fuel filter may be cloged . Unless If the check light is on or flashing you may want to check for trouble codes

crank shaft sensor..it happened on my 2000 blazer..you might check it out.....it's weird...