i've got a 1973 650 merc 3 cylinder that run good wide open idles not bad but if i hammer on it from an idle it just dies unless i back the throttle back off to an idle and ease up on the throttle til i get it up and goin. Could it just need new plugs? what plugs are the best to put in i left the boat at the lake and forgot to bring an old one home any help would be great