Having owned this car for a while now, I've learned to notice the smallest things like new noises or weird behaviour. I then get paranoid, and stop driving till I get an expert's opinion it before it amounts to any serious damage. Unlucky then, that this happens on a weekend .
I'm not sure what the symptoms point to, but my first educated guess is a misfire:
On acceleration, mostly higher in the RPM range, the car seems to hesitate intermittently. Like 'brrrrraaaab-b-braaaaaaaaaaab-braa..."
This is on IK22, 440cc, 255lph, 1.1 BAR max setup. Shall I have the plugs changed? Or do you guys know if there's anything else that can cause this?
B