was overfueling like mad so i thought it was a problem with the metering unit thingy!!iv never seen or played with these so i wanted someone to take a look but since then it started misfiring badly!so i carried out some checks and found i had fuel in the sump and am loosing pressure on cylinders 1,3 and 4!!!!!so iv just ripped the head off and found some bright spark who rebuilt the engine just before i bought it didnt grind the valves in and fitted the wrong piston rings!!!!!!!!!!!!!!!!!!!!!!so now im going to start the rebuild !!!with some nice new shiny bits!!!might even go for efi due to what people are saying about metering heads!!