Igntition timing

[SutteR]

Thanks all the advices.
My cylinder head has been renewed only a month ago. The ignition, the timing (crankshafts) have been set to their right positions and values.

There was a trackday on a rallycross track (not so hardcore, believe me), where she suddenly lost power. My exhaust was leaky and it got one more leak at the "Y". I thought that the powerloss and this new leak are in connection with each other but now it seems they weren't (since I have a new exhaust).

I thought that the distributor "felt down" to the bottom position (means: got retard timing) when hitting a bump, but that has not happened. My ignition timing is OK now. I think it's more a fuel problem somewhere....but dunno...