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?

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?
The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details
  1. Home
  2. Questions
  3. Idling problems and difficult startup

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: Transmission not shifting right on a '96 GMC Jimmy

At that age I'm amazed it's still running. It probably needs an overhaul. But do what I always tell people with those things, change out a quart of transmission fluid and put in one quart of Lucas anti-slip additive and...

Q: Q: Car will turn over but not start.

Hi there. You will need to add a pint of fuel water vaporizer to the fuel tank. There is excessive water in the fuel system and that is why your exhaust is white is if there was water in the...

Q: Ticking sound while accelerating and when the car is in gear

There is technical bulletins for your vehicle using aftermarket oil filters. These oil filters may look like they fit your car model, but do not allow the proper oil flow to the motor and can cause noises and internal engine...

Related articles

What Causes Hoses to Leak?
While the largest part of your engine is mechanical, hydraulics plays a significant role. You’ll find fluids at work in a number of different areas. Your car's fluids include: Engine oil Transmission...
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...
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...