g1234

ive been out at my mates most of day scraching my head his series 2 we rebuilt head n gasket ect as it was bought in bits now got it running in a fashon but it wont run right get it going its missing on tick over run it up road it misses like hell but soon as it boost runs mint but wont tick over or anything and always wants to stall soon as it gets a little warm it will not fire back up i think it is overfueling badly but how can you alter this a little to at least get it to run half decent or any suggestions
had new plugs n dizzy cap leads timing has been checked and double checked