Skip the auto shop - Our mechanics make house calls

Q: RPMs fluctuating

asked by on

I have taken my car to many mechanics but can't seem to find the problem. My car starts fine, but when I start driving it randomly fluctuates between 500 RPMs and 1500 RPMs. I also sometimes get small surges, as if someone was pushing in the gas pedal. I will stall when stopped if I do not push the gas pedal. And the car will also begin jerking when the gas is pushed and released. None of this is consistent; it just happens randomly, daily, or weekly. I replaced the EGR valve and the idle control valve, but that did not solve any of the issues.

This sounds like there could possibly be a vacuum leak somewhere. My other guess is that the new idle air control valve may also be malfunctioning. If you switched out some parts lately, getting new car parts that are bad right out of the box is starting to become more common, especially with cheaper parts. I would recommend having a mechanic from YourMechanic come to you with their specialized diagnostic equipment to figure out why your car is stalling and acting up the way it has been.

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: Car don't move

I would need vehicle model and engine size to help to diagnose. However, the check gauge light comes on to tell you to check a gauge. What gauge was showing a problem? Was their a Check Engine Light on or...

Q: INTERMITTANT STARTING

Your engine needs a few things to start and run: Compression, Fuel, Spark, Timing, and Voltage. An intermittent no-start would lead me towards no spark or no fuel pressure. You need a fuel pressure gauge to check the fuel pressure...

Q: Rear brakes

Hi There, It sounds like you may have a brake fluid leak, which will cause the brake light to come on as the brake fluid sensor senses the fluid is low. The other possibility may be that the brake pads...

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...
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...
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...