I just bought a 94 vulcan 750 from a local dealer and when I get to aboat 50mph it starts to sputter...Pa Pa Pa Paaaaaaa Pa Pa Paaaaaa Pa Pa Pa Pa Paaaaaaaa Pa Paaaa(the sound it makes) i can feel it cut out as well with power. Im gonna change the plugs and do the basics. Could it be a basic thing or is it more a compression or engine problem??? Anyone else gone through this?? Please help me thanks! Also if i give it gas it doesnt do it it sounds great just when im trying to keep a constant speed.