Just finished building a 3dr drift project , it's yb powered and not running cleanly.

I don't seem to have a great /any spark at number four as if I unplug four spark plug I don't get a note change and the disb cap earths /sparks to the inlet manifold,
All other cylinders drop note when unplugged but also hear a clicking sound from dist cap ??

I unplugged the dist multiplug and when I plug it back in the std fuel press reg opens/activates (strange one)on the fuel rail

I changed to a new cap and just swapped over five leads and cap from my running cosworth to double check ???