Q: After driving awhile, when idling, RPM drops below 500 & car stalls. Happens rarely but RPM fluctuates, and drops suddenly.

asked by on

I drive my car around, and it is fine when driving, however I noticed when I am stopped at a red light, the RPM meter fluctuates and bounces up and down between 500 RPM and 1000 RPM. After about 15 minutes of driving, RPM drops and car stalls. Have to restart the car to fix the issue and be able to drive again. This only happens sometimes, why?

My car has 208000 miles.
My car has an automatic transmission.

If you are having a stalling problem then you may have a computer code stored in memory. I suggest having the computer scanned to see if there is any codes stored and diagnose them as needed. The intake hose and air filter should be inspected for leaks in the hoses and dirty or leaking air filters. If the air filter is dirty or leaking then have the mass air sensor cleaned. If you still need help, have a mechanic diagnose the stalling issue for you and let you know exactly what repairs should be done.

Was this answer helpful?

Need advice from certified mechanic? Get help now!

Over 1,000 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

Ask a Mechanic
(100% Free)

Have a car question? Get free advice from our top-rated mechanics.

Ask A Mechanic
Over 10,000 questions answered!
  1. Home
  2. Questions
  3. After driving awhile, when idling, RPM drops below 500 & car stalls. Happens rarely but RPM fluctuates, and drops suddenly.

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: Engine cranks but won't start 2005 Ram 1500

Did the Check Engine Light illuminate? If so, a fault code may shed some light on the situation. Check your service history to be sure the maintenance is up to date, as spark plugs are recommended every 30,000 miles and...

Q: Shake when accelerating

Hi there: Based on your input, there are a few items that you might want to have inspected by a professional mobile mechanic to determine what's causing this shaking issue. First would be the tires and wheels for balance. Usually...

Q: Should I change my transmission fluid.

I would not recommend changing the fluid or getting a flush on the transmission since you are already starting to have a problem. A service may make it worse at this point. I would have the transmission checked by a...

Related articles

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...
Rules of the Road For Iowa Drivers
Driving on the roads requires knowledge of the rules, many of which are based on common sense and courtesy. However, even though you know the rules in...
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.