Q: Horrible acceleration, horrible fuel mileage, and misfire codes.

asked by on

When you give it gas the truck is slow to accelerate and often idles unsteady. fuel mileage is horrible 7-8 to the gallon.

My car has 155555 miles.
My car has an automatic transmission.

Hello. First task is to extract any problem codes, whether the Check Engine is set or not. There are many things that can cause the symptoms you describe: injectors stuck open, or fuel pressure too high, coolant temperature sensor malfunctioning (telling engine management engine is colder than it is), the engine running too cold, etc. To have this issue taken care of, I recommend having a certified technician diagnose the cause of the codes so that these issues can be resolved.

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. Horrible acceleration, horrible fuel mileage, and misfire codes.

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: Q: My 1998 Toyota Corolla won't accelerate

Hi, thanks for writing in. This may be likely related to a faulty mass airflow sensor which is a unit that regulates air intake as it is mixed with fuel. When this is faulty, it can cause an imbalance in...

Q: Mpg loss 2009 Toyota Tacoma

The cold air intake and oil type air filter are the problem most likely. The oil from the filter will contaminate the mass air sensor and cause it to not read correct. It may not set a code, but will...

Q: Trouble code P0303 - 2002 Dodge Ram 1500

Hello. If there is no misfire on the highway then you more than likely either have a vacuum leak that is causing this or more commonly a valve seat that is failing. I usually do a compression test first. This...

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...
P0052 OBD-II Trouble Code: HO2S Heater Control Circuit High (Bank 2 Sensor 1)
P0052 code definition HO2S Heater Control Circuit High (Bank 2 Sensor 1) What the...
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...