What is is with this car?

I gets ready to drop the tank and then it dawns on me. I added £10 worth of petrol and the car ran. On the road it wasn't too responsive. I bought a carburettor balancer and a Colourtune. I set the timing dynamically (it was reatarded) then I balanced the carbs. I fitted the Colourtune and my suspicions were confrimed. Project Blue was running too rich. No amount of tweaking with the mixture would make any difference so I set them to their initial settings. Things were better on the road but the car started misfiring and would cut out when I tried to set off in drive so I ended up leaving it for now.