Q: Car jerks and slows down

asked by on November 06, 2016

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

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

when I let off the accelerator it pulls to the left slightly

Pulling to one side can be caused by worn or loose suspension components, or even a brake issue. Does it pull harder to the same side or the opposite when you brake ? If so, it can be due to...

How do I clear MyKeys?

The MyKeys can be cleared very easily by following these steps: 1. Press the Up/down buttons on the steering wheel until Settings is displayed, then press the OK button. 2. Press the Up/Down buttons until MyKey is displayed, then press...

Whining noise when starting and rattling while first driving

You need to have a mechanic look at the problem to see if you are having a power steering pump noise and /or noise in the engine. From the descriptions you gave you may have more that one problem. ...

Related articles

A Buyer’s Guide to the 2012 Ford Escape Hybrid
Over Over the past few years, we’ve seen a major trend toward people choosing crossover utility vehicles (CUVs) over larger SUVs. The big motivator here, of course, is buying a more eco-friendly vehicle that will also save you a bundle...
A Buyer’s Guide to the 2012 Ford F-150
The The best-selling pickup truck in the US for over 30 years, the Ford F-150 has a lot to offer in reliability, durability, and the features that buyers want in a truck. The 2012 F-150 is not only a tough...
A Buyer’s Guide to the 2012 Ford Focus
The The 2012 Ford Focus brings a lot to the world of compact cars. Available as either a four-door sedan or a five-door hatchback, the Focus has great fuel efficiency and European styling that sets it apart from other cars...