Skip the auto shop - Our mechanics make house calls

Q: Sometimes my car has a rough idle and even stalls - 2004 Chevrolet Tahoe

asked by on

I've been having a rough idle and sometimes even stalling. RPMs drop, volts drop, and oil pressure gauge drops. No problems going down the road. Also if I pour a can of seafoam in the tank at every fill up in won't have any issues. Things that I've done already: 1. Had throttle body and injectors cleaned 3k miles ago 2. Changed to synthetic oil 3. Cleaned mass air flow sensor 4. New air filter 5. New battery 6. Alternator is less than a year I have owned this Tahoe for almost 5 months. When I had the throttle body cleaned the shop said it looked like it had never been cleaned. Running seafoam in the tank will have it running smoothly, but as soon as I do not add it the problem comes right back. Not sure if the throttle body and injectors need to be cleaned again or if it's something else.

My car has 124000 miles.
My car has an automatic transmission.

Hello. From my experience with this engine, the issue is usually due to the fact that the throttle body plate is worn out in the bore, or, more commonly, it is caused by an issue with the intake manifold gasket leaking. I always scan for codes first and check the fuel trim readings which would tell me if this is an air leak issue. Then I check for leaks around the intake gasket. It can also be a failure in the MAF, but that is not as common.

If you want to have this low idle fixed, consider having a certified mechanic, such as one from YourMechanic, come to your home or office to diagnose why the car is idling rough.

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
  • Home
  • Questions
  • Sometimes my car has a rough idle and even stalls - 2004 Chevrolet Tahoe

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: Won't take fuel. Keeps coming up fuel filler neck

Unfortunately the information provided is not quite enough for me to give a proper diagnosis. Typically when you fill up your vehicle and you notice that the gas nozzle keeps clicking, this is due to an abundance of air in...

Q: dtc P1682,no crank no start.

Hi there. The code you are getting P1682 is due to the ECM seeing a difference in the voltage levels of the two main power inputs to the ECM and will store the code when one voltage is different than...

Q: Car does not stay started in drive.

It sounds like you may have a problem with the transmission. I would take the car to a transmission specialist to determine the problem. I suspect that it is something bad like the clutches in the transmission are worn out...

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...
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...
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...