Missfire when cold

[N1CKY]

So this has been getting worse and worse, car is missfiring when cold. Engines rebuilt, reground valves etc.

The plugs are brand new plugs, i whipped the plugs out and no.3 was a wet black when all the rest are normal.

Any ideas?

[markg40T]

Check the inside of the distributor cap, i had this issue once it was condensation on the inside. then it had arced out and had a massive carbon build up on the contacts.
I would clean the contacts and make sure it is sealing will to the distributor.