Anyone reading this have any idea what might have caused the issues I had on Saturday morning.

After my first run of the event as I was coasting through the car park the car started lurching and surging badly, missfiring at idle.

The base line fuel pressure had dropped from 52psi to around 44psi. I adjusted it back up to 52 and it was behaving itself on the next run, idle back to normal.

Checked it again and it was up to 60psi, I adjusted it back down 52psi and the car performed perfect for the rest of the day and hasn't missed a beat since.

Anyone recognise these symptoms?

Car has a Processwest surge system with a Walbro 460 in it, lift pump is a dw300. Car has never missed a beat with this setup for nearly two years.

There were some very big bumps and dips in the track which bounced the car around a lot on my first run.

Could I have an electrical gremlin which upset the surge pump? Shit fuel (e85). Fuel reg malfunction?? (turbosmart 1200)

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Bye bye betty blue. Hello F6.