Q: My truck is starting to have a rough idol , I changed the spark plugs about 6 months ago.

asked by on

Rough idol changed plugs about 6 months ago

My car has 140936 miles.
My car has an automatic transmission.

The rough idle is often times associated with what is called an idle air control module/valve which regulates the air intake as it is mixed with fuel prior to being injected into the motor. When this is not working properly, this creates an imbalance in the air/fuel mixture which will cause the rough idle you are describing. I would recommend having an expert from YourMechanic come to your home to diagnose the rough idling and repair.

Was this answer helpful?

Hi. There may be a vacuum leak somewhere on the engine or loose or broken vacuum hose. A vacuum leak will cause a rough idle and may also the truck to stall and stop running. There also could be a problem with the electronic throttle giving a bad reading to the computer. There may also be a problem with one or more of the coil packs misfiring causing a rough idle. I suggest you have the vacuum checked for leaks and the Pcm checked for codes.

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
  1. Home
  2. Questions
  3. My truck is starting to have a rough idol , I changed the spark plugs about 6 months ago.

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: Parking brake light on. after changing rear pads, calipers, rotors. Bled brakes.

Hello. There may very well be an air pocket left in your line that needs to be bled out. One efficient way to tell if there's air in your system is pressing the brake pedal with the engine running, the...

Q: Makes a scraping noise when pulling a hill in overdrive

Hi there. The transmission is slipping in the overdrive gear. If the noise goes away when the rpm's increase dropping the transmission out of overdrive, then the overdrive gear clutch pack is slipping. I recommend seeking out a professional, such...

Q: My truck Will not turn over.

Hello, thank you for writing in. With the symptoms you are having, and the repairs you have already tried, it is looking like you have a failed starter. You will likely need to have it replaced. You can remove the...

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...
Rules of the Road For Iowa Drivers
Driving on the roads requires knowledge of the rules, many of which are based on common sense and courtesy. However, even though you know the rules in...
How to Avoid Back Pain in a Car
If you have back problems, sitting in a car for an extended period of time can be excruciating. Even without back problems, you could experience discomfort and soreness from...