i have a 1.8 zetec with bike carbs that have been set up by bogg brothers

when i pull the leads for cylinders 1&2 nothing changes.

whin i pull the leads for 3&4 the engine stalls

there is a spark through 1&2 leads

3&4 plugs are jet black which is usually over fuelling but the carbs have just been set up, could it be anything else?

1&2 plugs are just grey.

the car barely accelerates so im guessing all 4 arnt running properly although theres a spark at every lead

any suggestions?

thanks