I found the fuse holders were quite rusty & didn't look to be making good contact so I took them all apart cleaned & greased them as well as the bulkhead connectors & my problem seems to have gone away.

I have a car run this weekend so I'll give it a good run on Friday to make sure it is all good.

Driving home from the last trip out the car ran real bad at low revs & idle so I pulled the top of the factory AVS & found one of the floats had sunk. Easy fix as I have plenty of spares, adjusted the float level & drop, assembled carb & running well again.