Put in new Bosch from Amazon. That will fix it.
That is what I did.
No mucking around with cutting wires and all that.
Just get the one's that plug in - and you are done.

Unless you have bad valve cover gaskets and the plugs are coated in grease and sludge.
If not - just replace them..

Well, if you are on the east coast and salt has ruined everything then the rubber seals on the plugs may be leaking salt into the connections.

I miss the Fall season about the East Coast but not the road salt onslaught.