Q: car surges when idle or in park. rpm bounce. car has cut off, but cuts back on.

asked by on October 08, 2016

When I am parked or idle (stop light etc) I can feel my car shaking and surging. The RPM bounce. My car also cut out the other day, but cut back on after restarting it. I have had the water pump replaced, a new battery, a new thermostat, and some kind of pulley that was replaced when my car overheated. sorry don't know the exact name as I'm at work. what is wrong with my car? Need help!!!!!!!!!!

My car has 128000 miles.
My car has an automatic transmission.

It sounds like your idle air control valve could be failing. The idle air control valve is responsible for maintaining the proper amount of air into the intake while the vehicle is slowing down to a stop and resuming idle speed. When this valve fails, it can cause the exact symptoms that you described. I would recommend having the idle air control valve inspected by a qualified professional to determine if it is performing properly. If the IAC valve has failed, I would recommend having it replaced at your earliest opportunity.

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

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

Car won't start after replacing fuel pump

Hi there. If the car was running fine prior to the pump being replaced, then you may have a defective pump. If the same problem was occurring before the fuel pump was replaced, then there may be a circuit problem....

My windshield wipers keep stopping

The wiring in the wiper circuit should be inspected. If the wiring has a short somewhere, or even the relay or wiper switch, are allowing the wiper motor to draw too much voltage, the life span of the wiper motor...

Really bad vibration

Hello...The vibration problem that you are having can be resolved and your question is a good first step toward resolving it. There appears to be four (4) mounts in your application. Presumably you replaced all four if you suspected the...

Related articles

How Does an Engine Idle High and Low?
A common problem that car owners experience is high or low engine idle. A damaged intake gasket, cold air intake, or PCV valve can cause idle issues.
How Long Does an Idler Pulley Last?
The The drive belt that is on a car runs nearly all of the major components of the engine. Most of the newer cars on the market have a serpentine belt rather than various V-belts. In order for this belt...
How Long Does an Idle Control Valve Last?
Among Among the most important factors in having a smooth running car is a consistent idle speed. Having the incorrect idle speed can lead to a variety of different issues. There are a number of different components that have to...