Skip the auto shop - Our mechanics make house calls

Q: Idling problems and difficult startup

asked by on

My car has been idling poorly. It has difficulty staying up as well. I have to apply the gas and rev the engine up to get it to run. While idling, it would occasionally increase the RPM all of a sudden and stay at high RPM. This would keep the car running at the constant speed without me applying the gas. Also during idling, it happens that the RPMs decrease to 650 and it seems as if the car would turn off. So, I then put it in neutral to keep it running. I had the spark plugs replaced. Also the fuel pump relay is new. I changed the oil. What could be wrong?

A: There are many different items that can cau...

There are many different items that can cause the vehicle to idle poorly. The most common would be the spark plugs and wires, MAF sensor, vacuum leak, IAC valve, exhaust leak, or oxygen sensor failure. I recommend having the vehicle checked by a professional before blindly replacing parts. A qualified technician, such as one from YourMechanic, will be able to diagnose the idling issue and perform any repairs required.

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: After overhaul my Ka24 d21 doesn't rev pass 4000 rpm

Hi there. From the description you have provided, I'm not sure running a recently overhauled engine over 4,000 rpm is a good idea. There is a 500 mile break-in period recommended by most rebuilders. Change the engine oil and filter...

Q: Transmission problems

Hello. From what you describe it would appear that your transmission may be having some potentially serious issues. If the issues suddenly appeared after difficult shifting and a noise it could be possible that the transmission suffered some sort of...

Q: RPMs higher than normal

If the problem has just started to happen and you have not changed the tire size or anything else then I would say your clutch is slipping and the clutch would most likely need to be replaced. If you feel...

Related articles

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...
How to Avoid Back Pain in a Car
If you have back problems, sitting in a car for an extended period of time can be excruciating. Even without back problems, you could experience discomfort and soreness from...
How Much Does a Mechanic Make in Vermont?
Automotive technician jobs in Vermont have an average mechanic salary of $37k, with some mechanics earning a salary of $53k.