Q: Car is running good but is dropping RPMs when idoling

asked by on May 30, 2017

I have a 2011 hyundai elantra. When car is at a stop the idle of the car drops down and then comes back to regular . Then it drops down and comes back up. While driving no problems.

My car has 135000 miles.
My car has an automatic transmission.

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


Experienced Mechanic?

Earn up to $70/hr

What others are asking

Check Engine Light staying on
Your engine may need a tune up. Your engine, in addition to spark plugs and wires, also has a distributor cap and rotor that need to be replaced as part of a tune up. Commonly, over time, the metal parts...
Crushed Oil Filter
Yes it could, the filter was designed for the thinner oil. Running the extra thick oil will starve your engine bearings of the necessary oil for lubrication. The thick oil will cause you to burn less oil due to the...
My car will not turnover at all! no spark not even does it try to start up i have replaced the distributer starter spark plugs
If the starter motor is not functioning (that is, if the starter is not engaging the flywheel and turning the engine over), either there is no power to the starter or there is power but the starter (https://www.yourmechanic.com/services/starter-replacement) itself has...
My Hummer shows code P0300 after getting gas
You may have got contaminated fuel from the gas station. The code P0300 indicates you are getting a random engine misfire (https://www.yourmechanic.com/services/engine-is-misfiring-inspection). This random misfire does not point to any one cylinder misfire and indicates that the fuel may be...
07 BMW 328xi pre LCI, HID Conversion causing lamp errors and red car on lift notification
It's getting harder and harder to do modifications to a car, even minor ones without causing other issues. The lighting module is clearly not seeing the levels that it expects to see when it powers up the lights. Many accessory...
My 2003 Honda Accord European has developed a gearbox transmission issue.
Hi there. When the transmission is not shifting then this is a condition called limp mode. The computer put the transmission in limp mode for a fault that the computer picked up. Check the wiring harness to the transmission and...
2010 BMW 750i will not engage into park goes to neutral
Your car has an electronically controlled transmission that has had a series of issues. So it could be a transmission problem, or it could a control issue. .Whatever the problem, a technician with the right scan tool should be able...
Camaro seats
Hi there. You will most likely have difficulty with compatibility with these two years of Camaro. Although they might physically fit inside, they would probably require fabrication of the seat mounts to work correctly.
I have no power at all. No dome light, no radio, nothing. I have replaced the alternator battery and starter and checked all fuses
I suspect your problem is in the power distribution box or in the connections going to it. Chrysler has a fancy name for it, they call it a TIPM for Totally Integrated Power Module. These modules have a lot of...

Related articles

A Buyer’s Guide to the 2012 Hyundai Sonata
Hyundai Hyundai has been making a real name for itself in the midsize sedan class in the past few years, and the 2012 Hyundai Sonata is no exception. With an attractive price tag, a great warranty, and a choice of...
The Best Used Cars to Buy For Fuel Economy
Saving money on gas is an important factor to consider when buying a car. The Honda Civic, Toyota Prius, and Ford Fusion all have great fuel economy.
Understanding Hyundai Service Required Lights
Car symbols, or dashboard lights, are a car service reminder. The Hyundai Service Required light indicates when your car needs service.