Originally Posted by frog
Then screw/unscrew the white plastic nut through which the throttle cable goes until you get the car to idle at 850/900 rpm. I find it's worth giving the throttle pedal a little push after every adjustment. Note, a tiny amount of change on the plastic thingy can make a big difference so go slow.
Mr Frog.. much as i hate to say this, that is a bad thing to do for many reasons...
The first part was correct, but to adjust the idle speed you must ONLY use the idle speed control screw located unbderneath the throttle body at the front. using the cable as you have done alters the TPS signals relationship between on and off throttle which can cause numerous running and fuelling problems.
Hope this helps.