Skip the auto shop - Our mechanics make house calls

Q: shutter

asked by on

when im at a stop sign or red light my car shutters like its going to die but then it stops it does it more when the ac is on.

My car has 98000 miles.
My car has an automatic transmission.

Hi there. When the engine is put under a load by the AC system, the car’s computer automatically attempts to compensate for that by adjusting the idle. If there is carbon buildup within any part of the system, including the idle air control valve, throttle body, or possibly even the EGR valve. The car’s computer essentially miscalculates the amount of power necessary, and ends up overshooting, leading to a surging engine. The best way to determine the source of this issue is to have a professional mobile mechanic come to your location and complete an inspection.

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

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: Dark green sludge

Hi, thanks for writing in. Dark green sludge is most likely grease from an outer CV joint boot that has split open on whichever side you are seeing it. If you would like help with the repairs, consider having an...

Q: What conditions will cause an Intelligent Key to not work?

The Intelligent Key may have trouble operating when one of the following occurs: 1. Strong radio waves are present, such as those from a TV tower. 2. The battery in the Intelligent Key is dead. 3. Wireless equipment, such as...

Q: Would this result in the check engine light turning on?

The check engine light indicates that the engine controller (ECU) has detected a fault in the system that could effect the exhaust emissions. The ECU stores a trouble code to help technicians diagnose the problem and lights the Check Engine...

Related articles

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...
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...
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...