Q: Q: Car jerks and slows down

asked by on

When I'm on the highway going 70mph, the car would jerk when I press on the gas and the speed would drop down to about 50 or 40. When I press on the gas it either does nothing or the car jerks even more. If I just drive at that speed for a while it goes back up to 70. I usually drive to places closer than 30mins away and I don't have this problem. However, I need to drive 4 hrs to visit my parents a few times a year and that's when this happens. I have to drive home to vote on Tuesday and I'm wondering if the car can make it.

My car has 200000 miles.
My car's transmission is unknown to me.

Hey there. This may be a sign of a dirty or failing mass air flow sensor. The mass air flow sensor is a unit in the intake system that monitors air intake as it is mixed with fuel prior to being injected into the motor. When this fails, this can cause an imbalanced air/fuel load to be supplied to the motor which results in an over fueling or under fueling situation depending on the conditions. This is what causes the hesitation or loss of power you describe. This may also cause a jerking type reaction by the car when pressing on the gas pedal as you describe. I would suggest having a professional from YourMechanic come to your home to diagnose the jerking issue and move forward with repairs.

Was this answer helpful?
The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details
  1. Home
  2. Questions
  3. Q: Car jerks and slows down

Get an instant quote for your car

Our certified mechanics come to you ・Backed by 12-month, 12,000-mile guarantee・Fair and transparent pricing

Get a quote

What others are asking

Q: uncontrolled acceleration

Hi there. First, we're glad you were able to get your van stopped. A stuck throttle is never a good thing. In the case of your 2009 Grand Caravan, the issue may be caused by a broken cruise control cable...

Q: Q: Car does not start

Hello. If the engine is struggling to crank, or not cranking at all then the cold temperatures may be playing a role in your starting issues. As the temperature decreases, the amount of effort required to start an engine increases,...

Q: Q: Car will start but will not run.

Hi There, A few different things will usually cause the vehicle to start and then die. A bad ignition coil can cause this if it is beginning to fail, resulting in intermittent starting problems. A dirty or faulty mass air...

Related articles

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...
Rules of the Road For Iowa Drivers
Driving on the roads requires knowledge of the rules, many of which are based on common sense and courtesy. However, even though you know the rules in...
What are the Car Pool Rules in Hawaii?
Hawaii is widely regarded as a land of vacation and relaxation, and as such, its scenic roads and routes are far better known than the state’s freeways. But, as with all...