I have a 1993 Rude 200XP that runs like a champ. this year after decarb I changed to new plugs instead of the Champs I was told to try NGK because they were "better" by a freind. after a few tanks of fuel I noticed a miss then it happened more frequently. and now getting the Nitro on plane the motoer misses and sputters. The mechanic at the marine store said NGK's take out the powerpacs in this model Rude engine, is this true? The boat/motor are at the doctors to fix and I am just checking with the gurus here to confirm?

Thanks in advance