i read this (on p2), sounds a bit like my fault, & my starter plays up at times (like pre-ignition) :Thought i had sorted it the other day with new fuel reg but the next time i started it it was the same,ran like a bag of crap for 1/2 min when cold.
Ok i have sorted it now ( thanks to Danny Fiestacossie who lent me a loom,ign amp & coil to try ) IT IS DEFINATELY MY IGNITION AMPLIFIER THAT IS AT FAULT , swapped it over for another one & it has been fine, swapped it back to the old one & it ran rough for a while when cold. Also this was the cause of what i thought was a dodgy starter motor as well as when cranking it sounded as though the starter motor wasn't always engaging properly , with another ign amp this has gone aswell. I have swapped them over a couple of times & it plays up everytime with my old one, also noticed that my one is not a webber marelli one its a copy. Explains why i only had this problem after fitting a grp A coil, it must of killed something in the ign amp.

Thanks Danny for lending me the bits, i'll get them back to you soon as mate

Simon