My car idles really crappy at 500rpm, and I mean the car really shakes and its bumpy.

However when the car sits at like 800rpm I believe (the tick mark between 500 and 1000RPM) it is so smooth. Like I can't feel a damn thing.

It seems to have a consistency of running a thousand times better when the car is cold. I have no idea why, how, or when, but I can definitely feel a difference. It only stays at like 800 rpm for about a mile or two then it drops down again to 500 rpm when the car is fully warm.


I am trying to figure out a way to adjust my idle or increase it so it stays at 800rpm but the idle key I believe is computer controlled and I have no means.

I would also like to know if anyone would be of any help.

I changed distributor cap and rotor not too long ago.



I am tired of making assumptions basically, I haven't changed the fuel filter yet, but I think my problem is really idle speed. At 500 rpm it just sits too low in my opinion and it becomes shakey at that point.

Is there a way to manually set the idle to 800rpm, any input is helpful

 

Sounds to me like your computer is not reading the correct engine RPM. Anyway, you can set the minimum idle air by turning the small screw on the back of the throttle.