Skip the auto shop - Our mechanics make house calls

Q: Problem with speed. No check engine light on but when accelerating speed, it decreases then speeds right back up. No stalling at all

asked by on

Problem with speed. No check engine light on but when accelerating speed, it decreases then speeds right back up. No stalling or stopping at all

My car has 147564 miles.
My car has an automatic transmission.

A: Hi, thanks for writing in. This is a common...

Hi, thanks for writing in. This is a common problem associated with fuel/air delivery which is very commonly related to what is called a mass airflow sensor. This monitors the flow of air intake into the throttle body as it is mixed with fuel to deliver the right air/fuel mixture into the motor. When this is not working properly, this will cause this kind of hesitation or surging when trying to accelerate. I would recommend having an expert from YourMechanic come to your home or office to confirm a diagnosis on the issue and make or suggest the necessary repairs or replacements.

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: Engine hot, difficult shifting, shutting off

Hello there, thank you for asking about your 1987 Oldsmobile Cutlass Calais. A common problem that can cause stalling is a stuck torque converter clutch. This device connects the link between the engine and transmission, but should slip some when...

Q: Vehicle is clunking

Hi there. This can be caused by a few different things. From my experience with this vehicle it is usually a bad u-joint or the rear differential. I usually get the vehicle in the air and check the u-joints first...

Q: Brown stuff shooting out of radiator

You could either have air trapped in your cooling system, or you might have a bad head gasket. Based upon your description, I am leaning towards a bad head gasket. Testing the head gasket can be performed with a block...

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...
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...
P2103 OBD-II Trouble Code: Throttle Actuator Control Motor Circuit High
P2103 means there is a fault with the throttle actuator control motor circuit, likely due to a defective electrical component or part.