Skip the auto shop - Our mechanics make house calls

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.

A: Hello. If the idle is that low, then it can...

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 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: car cutting out in low gears on stopping, traffic lights and junctions

Hello. This is often times a sign of a failing mass air flow sensor. As you may know, this is a unit that monitors the air flow into the intake as it is mixed with the fuel prior to being...

Q: Hello,

Your vehicle may have experienced a horribly clogged catalytic converter. These will usually hinder engine performance to a great degree and you may hear a blowout if the catalytic converter gets too hot and the materials inside start to melt....

Q: AC blowing warm air

Hi. The problem your described is an indicator that the coolant fan for the condenser is not working properly. If the fans are working properly, I suggest having the refrigerant pressure check by an EPA certified technician. If you need...

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 Long Does a Heater Control Valve Last?
Keeping the right amount of coolant in a car is essential in keeping the engine at the right temperature. Failing to have the right amount of coolant or even bad elements...
Rules of the Road For Iowa Drivers
Driving on the roads requires knowledge of the rules, many of which are based on common sense and courtesy. However, even though you know the rules in...