Seems to only happen when accelerating for the first 2 secs or so.
Its not all the time, just some of the time when accelerating, particularly in low gears.
A mate of mines said it could be pinking, but ive tried using Optimax to see if that helps, but its still there.
Any other ideas on what it could be?
It doesnt do it at any other time, like braking, cruising (no accel. or brake) etc.