It will start up and idle and rev fine but when i start to move it makes a wierd missing noise...like its the clutches???but then after i stop and i rev it up it revs fine...and when ever its starting to go back to idle it will make a really wierd missing sound..i mean i need a head gasket but would that be it?and what do you guys think about the GT Thunder 465ex kit???plenty more power than my wiseco 440???anyone know a cost of it?

 

Sounds exactly like a fouled plug. It will rev fine, with no load, but as soon as the engine has to work a little harder, it cuts out.