I can't get my Astra Cesaro to idle properly - it's always too low and on the verge of stalling.
I have immaculately cleaned the ICV and throttle body - no change.
I replaced the ICV with a known good one - no change.
I then adjusted the throttle stop screw to open the butterfly a little more - no change!
Checked for the usual air leaks - everything seems fine.
Car otherwise performs perfectly.
So I'm stumped now.
I've noticed, that when the car is moving and the clutch is down, or it's out of gear - the idle speed is perfect....
Any ideas guys?