Skip the auto shop - Our mechanics make house calls

Q: Car starts then sputters off

asked by on

My impala lights turn on when key is turned , car starts but sputters off after a few seconds like I'm out of gas . The day prior I noticed that when on the highway I pressed the gas to go faster and the engine reved a few seconds late . Someone told me spark plugs, someone said fuel pump and or the relay , also someone said the fuel filter but now I heard it's inside the tank. Please help me!!!!

My car has 120000 miles.
My car has an automatic transmission.

A: This may likely be a fuel supply issue such...

This may likely be a fuel supply issue such as low fuel pressure or a faulty throttle position sensor. The throttle position sensor is a unit used to monitor the throttle position of a vehicle. This sensor relays the position of the throttle plate relative to your foot's position on the gas pedal. The ECU then makes the direction to supply more or less fuel to the motor. When this sensor is not working properly, this can cause intermittent responses when pressing the gas pedal. To avoid any unnecessary repairs, I would suggest having a professional from YourMechanic come to your home to diagnose this sputtering issue and replace this sensor if needed.

Was this answer helpful?

Need advice from certified mechanic? Get help now!

Over 1000 mechanics are ready to answer your question.
The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details

Ask a Mechanic
(100% Free)

Have a car question? Get free advice from our top-rated mechanics.

Ask A Mechanic
Over 10,000 questions answered!

Get an instant quote for your car

Our certified mechanics come to you ・Backed by 12-month, 12,000-mile guarantee・Save up to 30%

Get a quote

What others are asking

Q: The car cuts off mostly towards a stop sign. When I start an EPC warning light, it shows on the dashboard.

At such a high mileage, it could really be just about anything. But the first thing I would look for is air leaks. There are a number of rubber hoses and boots under the hood that have to remain air...

Q: Engine hesitating in the first 20 minutes of driving when cold

This could be caused by a cold state vacuum leak. Basically, this is a condition where a vacuum leak is present until the engine heats up and the induction parts expand and seal the leak. When the vacuum leak is...

Q: Car running hot

The coolant may not be leaking, but fumes from the overflow can be smelled when it is running hot. Your vehicle should be checked to see if the fans are working, and the thermostat is okay. A pressure test for...

Related articles

How Long Does a Distributor O Ring Last?
The distributor is part of the ignition system in your vehicle and its purpose is to route high voltage from the ignition coil to the spark plug. The spark plug then...
P0240 OBD-II Trouble Code: Turbocharger Boost Sensor B Circuit Range/Performance
P0240 code definition Turbocharger Boost Sensor B Circuit Range/Performance What the P0240 code means P0240 is an OBD-II generic code triggered when the Engine Control Module (ECM) detects the intake boost...
How to Avoid Back Pain in a Car
If you have back problems, sitting in a car for an extended period of time can be excruciating. Even without back problems, you could experience discomfort and soreness from...