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・Save up to 30%

Get a quote

What others are asking

Q: At light or slowing down, car has irregular idling rev

Hello. Most of the time when this issue occurs, it is due to a faulty idle air control valve. This valve is responsible for letting some air from the air cleaner bypass the throttle body so that the engine can...

Q: Car starts and then stalls.

The Check Engine Light means there are faults stored in the engine computer's memory. Reading out these codes and then correcting the causes for these fault codes would be the first step to getting the engine to run correctly. The...

Q: acts like it is out of gear when rpms are high..

Based on the information you provided about your 2002 F-150, it sounds like you could have internal transmission issues. The first thing I suggest is to check the transmission fluid. You should look to see if it is full. If...

Related articles

How Do Power Car Windows Increase Passenger Safety?
Power windows are responsible for approximately 2,000 emergency room visits every year. When a power window closes, it exerts enough force to bruise or break bones, crush fingers, or restrict an airway. Though...
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.