Skip the auto shop - Our mechanics make house calls

Q: I have an issue with my Tahoe its idling rough the hand stays on 500 rpms but you can hear it in the engine

asked by on

I have a 2003 Chevy Tahoe with 5.3L flex fuel. It's idling rough but the rpm hand stays on 500 rpms but you can hear it in the engine it will idle fine for a minute but then it will idle weird for about 30 seconds then go back. When I put my hand at the end of the exhaust pipe it blows out barely. Also my vapor canister surge soleniod has a vaccum going to it and a plug I checked the power to it and it has power but when I pull the vaccum line off of the vapor canister purge soleniod it is not sucking in air through the line at all so what do I need to do? Also it says misfire on cylinder 5 but I changed the injector, changed the coil, changed the plug and wires also checked the wiring to cylinder 5 and all others they have 12 volts going to it the injectors and coils has 12 volts and the compression is good all the ground wires are good what do I do to fix this its drinking gas bad

My car has 240300 miles.
My car has an automatic transmission.

It would appear you have already attempted to perform all of the normal repairs to fix this issue. Due to the high number of repairs made, you may want to start by retracing your steps and confirming that all the repairs are holding and functioning well. With that being said, one of the only aspects it appears you haven’t considered would be air.

Are your oxygen sensor working correctly? Have you looked at things as simple as the air filter and mass airflow sensor? Any one of these components can be sending bad signals to your computer and causing issues. The misfire is the reason you are experiencing bad gas mileage. Its most likely the reason you are having rough idling as well.

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
  1. Home
  2. Questions
  3. I have an issue with my Tahoe its idling rough the hand stays on 500 rpms but you can hear it in the engine

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: Shifting into 2nd at high RPM

Hi there. It is very possible that the speed sensor or shift solenoid is the primary source of this type of issue with the first to second shift. However, a worn out torque converter or an obstruction inside the transmission...

Q: 1999 Jeep Cherokee idles fine, loss of power at higher rpm. Cruise control stopped working at the same time. Stalls at stopped when revved up from idle.

The cruise control switch could have an issue and may have shorted the contacts inside the switch terminals. For the engine stalling after pushing on the throttle pedal, there could be either a vacuum leak on the engine or the...

Q: P0300 Random misfire.

Without seeing the fuel trim readings in the computer to see if the engine is running too lean then it would be a guess that you have a vacuum leak between the mass air sensor and the intake manifold or...

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...
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.
P2103 OBD-II Trouble Code: Throttle Actuator Control Motor Circuit High
P2103 means there is a fault with the throttle actuator control motor circuit, likely due to a defective electrical component or part.