Vectra c 2.2 sri Direct.
My car shakes at idle, however the revs do not fluctuate with the shaking.
The shaking starts after 4seconds, before that, the car idles like normal.
At idle, the revs are at 800.
No engine light or warning lights.
Used diagnostic machine, no faults found.
When the revs are above 800, the car is smooth again, no shaking. Drives without any misfire through the rev range.
No loss of power, if anything it feels more responsive.
Things i've replaced recently
[Timing chain and balance belt, new guides and tensioner]
New spark plugs
Tested my friends coil pack on my car, made no difference.
Tested maf. No difference.
I done a 300mile journey yesterday, no problems apart from the shaking at idle.