Unstable idle and strange shaking

[Angus]

My car idles very unstable...... sometimes I can feel the car shaking......
What's wrong? Thanks!! BTW, I have an injen intake, is that a problem because of that?

 

[jasoncitrano]

Could be your Idle speed control motor, get the car up to operating temperature then bring it back somewhere and let it idle, wait for the fans to kick on, right before they kick on you should see your engine shake like a bi*** if it does...your Idle speed control motor has died!

 

[Angus]

all right, thanks for the information
i will try it as soon as possible!

 

[gstowner]

How much does those usually cost?

 

[84fiero4speed]

I replaced mine with a unit from the dealership, that ran $255 and it was in stock. I work at Autozone and we have one for $225 but it has to be ordered in. For a $30 difference I'd go to the dealer and get it, however, I think mine may be going out again after 1 1/2 years which makes me kinda question the quality, but I guess quality doesn't come better than the factory replacement right?

 

[GriffLaserRS]

I just swapped over the throttle body with all sensors that I pulled from a junk yard. Cost me $20 for it all. MY throttle body was junk along with all sensors. Took me less than an hour in my front drive @ 20degrees. The car runs better now but still bucks and shakes. My next guess is the ECU Ill be replacing the caps next.