Skip the auto shop - Our mechanics make house calls

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.

A: Hey there. This may be a sign of a dirty or...

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?

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

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: Car shakes and stutters during acceleration - 2001 Toyota Echo

As I was reading this I was thinking spark plugs, but you said there was a couple CENTIMETERS of translucent yellow oil? I can't even imagine what must be happening inside the engine to completely cover spark plugs. I would...

Q: Truck suddenly wont start. Starter is good. Been diagnosed with intermittent issue. Need advice. No crank, no start.

Hello, thank you for writing in. These issues can be very frustrating. The first thing to consider is that most automotive parts stores that test starters do not "load test" the starters. This means they test the ability of the...

Q: Hi my car wont start I read it could be the starter or a wiring loose or could be the battery

Without further starter circuit tests to see if the complete circuit is operational and the theft system is not activated. The theft system will not let the starter relay operate if the key is not disabling the PATS system. Have...

Related articles

How Do Power Car Windows Increase Passenger Safety?
Power windows are responsible for approximately 2,000 emergency room visits every year. When a power window closes, it exerts enough force to bruise or break bones, crush fingers, or restrict an airway. Though...
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...
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...