Q: Car idles rough when in gear

asked by on

My car idles rough when I put it into gear, and it sounds like it is about to die, especially when not fully warmed up. Turning the AC on makes it worse, and when I come to a stop.

Hello. If the idle is that low, then it can be caused by a number of things. Most of the time it is caused by a vacuum leak or a dirty throttle body. The throttle body being the most common. I typically clean the throttle body first to see if it clears it up. If it does, then the problem is solved. If not then the issue may be from dirty fuel injectors or it may need a tune up. If you need to have this diagnosed, consider YourMechanic, as a certified mechanic can come to your home or office to locate the cause of the rough idle and make the necessary fixes.

Was this answer helpful?

Need advice from certified mechanic? Get help now!

Over 1,000 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
  1. Home
  2. Questions
  3. Car idles rough when in gear

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: My engine won't idle after replacing the fuel injectors.

This sounds like potentially a idle air control problem. There is a component called an idle air control valve that regulates the amount of air flow at idle. When this is not operating correctly, the engine will not idle as...

Q: Cables that unlatch and unlock tailgate have rusted out, and I do not have a way to get into the trunk.

Hi there, thanks for writing in. Most truck lock cylinders can only be accessed by removing the rear seats, the trunk cover and crawling inside the trunk or contacting a locksmith to unlock the trunk from the outside. As far...

Q: How do I use the automatic air conditioner?

The automatic air conditioner will automatically adjust the air flow and fan speed to help keep the vehicle a constant temperature. To use this feature, rotate the Fan Speed Control dial to Auto, and adjust the Temperature Control dial to...

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...
P0240 OBD-II Trouble Code: Turbocharger Boost Sensor B Circuit Range/Performance
P0240 code definition Turbocharger Boost Sensor B Circuit Range/Performance What the P0240 code means P0240 is an OBD-II generic code triggered when the Engine Control Module (ECM) detects the intake boost...
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...