Idle shaking

[Fuggrwe]

Why does my 3.4L idle rough, whats the dillio???

 

[Thai]

What year is your 4Runner?? My '02 is rather smooth when at idle.

 

[Fuggrwe]

It's a 97 SR5, it was smooth until about 3 days ago, then I noticed a bit of shakiness.

 

[jharris2]

In various vehicles. I've seen rough idling from a number of causes. Simple ones to fix:

- Loose spark plug wire
- Loose distributor
- Poor quality gas (not as prevalent as in the past)
- Obstructed fuel filter
- Incorrect timing, fuel mixture, or idle speed (sometimes hard to figure out with the computers used nowadays)

Others that may be more complex to fix:

- Dirty fuel injectors
- Vacuum leaks
- Bad plug(s) or plug(s) with incorrect gap

Before you think differently, these are in random order.