Skip the auto shop - Our mechanics make house calls

Q: Random misfiring. Check engine light is on. Running real rough. Bad PCM?

asked by on

The check engine light is either on or blinking the engine is running real rough different lights on the dash go on and off and very loud when driving. Wants to stall at idle, shakes badly. Changed out the spark plugs and had absolutely no effect.

My car has 156000 miles.
My car has an automatic transmission.

A: Hi, thanks for writing in. There are severa...

Hi, thanks for writing in. There are several malfunctions that can cause a rough running condition. The spark plugs could be an issue, but it could also be a problem with the ignition, a fuel supply problem, or even a wiring issue. It would be best to have a certified mechanic, like those available at YourMechanic.com, to perform some diagnostics on the vehicle to identify exactly what is causing the rough running condition.

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

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: Can all the sensors on the truck be bad all at the same time?

The only times I have seen all the sensors burned out was when when vehicle was hit by lightning and another time when the vehicle was welded on with battery connected. I would get a second opinion before I would...

Q: Vacuum hose unhooked brake - 1990 Dodge D150

Hello. The vacuum hose from the brake booster goes into a tube on the intake. This tube is going to be about the same diameter as the hose and may need a clamp to secure it properly. The small vacuum...

Q: Fuel issues - 1999 Chevrolet Venture

Hi there. You may have a misfiring plug or plug wire that has not caused the Check Engine Light to come on yet, but may have stored a code. Have the computer scanned first. You may just have a carbon...

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 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...
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.