Skip the auto shop - Our mechanics make house calls

Q: rough idle when stop

asked by on

I have replaced the evap sensor, spark plugs, spark plug coils, gas cap, cleaned out the throttle body and the maf mass air flow sensor. The car runs roughly and its hard to pick up speed and power and when im at a red light the car shakes as if it wants to stall long as im moving weather or not its slow its fine but a complete stop and itll shake again. i also have the intake and exhaust camshaft position sensors to be replaced but I cant locate the old ones when looking at the engine. What can I do to restore power and stop the rough idle? 2006 chevy Malibu 4 cyl. 100K miles

My car has 101800 miles.
My car has an automatic transmission.

I would recommend using a portable scope to look at the secondary firing patterns which will enable you to narrow down the issue to fuel versus an ignition fault. The problem you are describing could be due to a faulty mass airflow sensor, throttle position sensor, faulty engine coolant temperature switch/sensor (typically at cold start only), inadequate fuel delivery or pressure (clogged fuel filter, injectors), contaminated or old gasoline, leaks in the EGR system, intake vacuum leaks, and so forth. If you request an engine stalling/rough idle diagnostic the responding certified mechanic will get this resolved for you promptly though. If you have further questions or concerns, do not hesitate to re-contact YourMechanic as we are always here to help you.

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

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!

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: How hard is it to change your muffler

If you see a hole in the muffler then you should have an exhaust shop check the entire exhaust system to see if other leaks are found and what needs to be done to repair the exhaust leaks. The check...

Q: The service engine soon appeared

If I understand you correctly the engine starts, then immediately shuts off? This could be anything from the need for an oil and filter change service, overheating problem, or failure of engine management components. I would recommend a "Car Is...

Q: Car stays cool while idling but once you start driving it it starts to overheat.

If the cooling fan is too small for the engine, then it may be enough to cool it at idle but not at higher engine speeds. Make sure you are not running under drive pulleys. You can check the coolant...

Related articles

How Long Does a Distributor O Ring Last?
The distributor is part of the ignition system in your vehicle and its purpose is to route high voltage from the ignition coil to the spark plug. The spark plug then...
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...
What are the Car Pool Rules in Hawaii?
Hawaii is widely regarded as a land of vacation and relaxation, and as such, its scenic roads and routes are far better known than the state’s freeways. But, as with all...