I own a Vectra C (2007) 2.2 Gas.
The last week it has started to swing at idle, just below 1000rpm. (800-900 rpm)
I have given the Bell add 4 in intake, but it does not work.
The car runs fine when driving, but jumps in idling when stopped.
My intake valve is clean and shining.
Could it be a hose that is leaking?
Any one??