My car used to do it on b roads without a flamer when it was stage 1, but only occasionally when giving it real horse and lifting from full throttle then reopening the throttle.

Really fast and bright flashes, not the drawn out flames you get from a flamer kit.

It's now on a MSD 803 0.63A/R T34 chip with Closed Loop fuelling and it does it like mad on gearchanges (with a flamer )

Neil.