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

asked by on October 27, 2016

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?
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

Passlock reset on 2002 Chevrolet Impala

Unfortunately the dealer is oftentimes the only place that can perform services such as this. This is due to the fact that specific scan tools are required in order to reset certain systems.

Rough idle and car dies - 2007 Chevrolet Impala

Hey there. This is a common sign of a dirty or failing idle air control valve. The idle air control valve monitors the air intake as it is mixed with fuel prior to being injected into the engine. This valve...

How do I set the parking brake?

The parking brake is a vital safety feature that helps keep your car from rolling when it is parked. You should always apply the parking brake when you park your vehicle on any incline, and it’s a good idea to...

Related articles

A Buyer’s Guide to the 2012 Chevrolet Tahoe
The The Chevy Tahoe has always been one of the most popular SUVs on the market, and this trend continued in 2012. As always, the vehicle proved to be reliable and powerful, with plenty of space and features that people...
The Best Used Cars to Buy If You're a Mobile Housekeeper
If If you are a mobile housekeeper, chances are that you are looking for a small, reliable used vehicle that offers good gas mileage and enough space to store your supplies. With that in mind, we present to you the...
How Does an Engine Idle High and Low?
A common problem that car owners experience is high or low engine idle. A damaged intake gasket, cold air intake, or PCV valve can cause idle issues.