Q: rough idle when stop

asked by on March 01, 2017

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?
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

Problems with shifting.

Transmissions can be totally destroyed inside and not shift or it could be something simple such as a speed sensor if reading erratic. The only way to tell is to have the system thoroughly checked by a certified transmission technician,...

What may cause my car to not crank

Hi there. It sounds like you have an issue either the ignition switch or the clutch switch. If either of these fail it will cause the starter to not get voltage. Most of the time it is caused by the...

Parasitic drain 2005 tahoe on ignition a fuse

Hello, thank you for writing in. Great job on the electrical testing thus far! A wiring diagram for the vehicle will work wonders for you if you can obtain one. If you are referring to the ignition switch fuse, then...

Related articles

The Best Used Cars to Buy If You're a Personal Assistant
As As a personal assistant, you have a lot of demands placed on your time. Often it’s important that you be able to get around town quickly, running a ton of errands, picking things up here, dropping them off there,...
The Top 5 Selling Cars in Alabama in 2012
2012 2012 was a great year in Alabama for auto manufacturing, but that wasn’t the only bright spot. Vehicle sales in Alabama were also robust in 2012. Nothing much changed in terms of the vehicle types that were most popular...
A Buyer’s Guide to the 2012 Chevrolet Silverado
While While the Ford F-150 is still the best-selling pickup truck in the US, the 2012 Chevrolet Silverado is one of the finest half-ton pickups available today. In fact, the Silverado and the GMC Sierra are actually the same vehicle...