Skip the auto shop - Our mechanics make house calls

Q: Car doesn't run right - 2005 Chevrolet Impala

asked by on

My car wasn't wanting to accelerate bounces up and down from 1500-2300 rpms sometimes, doesn't want to go above 3k rpms, it's like I have to let off the gas and let it shit (it's an automatic) to be able to somewhat accelerate, uses ALOT more gas. I took off 02 sensor and it drove fine for a little while, then started doing all of it again, also wobbles and whines like an electric vacuum gets louder as I drive Could it be MAF sensor or IAT sensor? What could be the problem? It's supercharhed not turbo

A: Hello and thank you for contacting YourMech...

Hello and thank you for contacting YourMechanic. You will need the check the idle air control valve (IAC). It is located just under the throttle body where the throttle plate is. Unplug the harness and check the plug for any debris, moisture, oil, or corrosion. If the plug is fine, use a digital meter and check for a voltage reference and check for a ground. If there is a ground and voltage reference, then the valve needs to be replaced. If you need further assistance troubleshooting your vehicle, then seek out a technician, such as one from YourMechanic, to assist you with your acceleration problems.

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・Fair and transparent pricing

Get a quote

What others are asking

Q: The front end and steering wheel shakes when I accelerate.

You may have a traction control system that is activating when you are accelerating. This can be due to one of two things: the speed sensors in the front detect that a wheel is going faster than it...

Q: While pressing on brake pedal, car accelerated

Hi there, gladly you are okay after your accident. Brake failure can be a result of several different things. This can range from a failing brake booster, to air in the brake lines, to worn brake pads. Based upon the...

Q: Intermittent failure to start.

Check the starting of the vehicle in park and in neutral. If the vehicle starts all the time in neutral, then the neutral safety switch needs replaced. If the engine does not start every time on whether the transmission is...

Related articles

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...
P2428 OBD-II Trouble Code: Exhaust Gas Temperature Too High Bank 1
P2428 code definition A P2428 trouble code signifies that the PCM has detected a problem in the exhaust gas temperature sensor circuit in bank 1, which subsequently contains the number one...
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.