Welcome to the forum Kosie,,,
I would also check spark plug wires (when its cold plus somme humidity) the older wire could have insolation problem beginning, the rubbers is not sealing and allows some electricity out causing missfire ... once warmed up the humidity goes away and it runs fine ( specialy that its worst since you manipulated them) keep us posted ...
I would also check spark plug wires (when its cold plus somme humidity) the older wire could have insolation problem beginning, the rubbers is not sealing and allows some electricity out causing missfire ... once warmed up the humidity goes away and it runs fine ( specialy that its worst since you manipulated them) keep us posted ...