Did you try all the cures before you put the new spur on????? When you say the "engine goes nuts" what exactly does it do (redline and stay redlined, or flactuate) Does it just do it out of the blue? When it eats the spur does the car move(while eating it) If the engine just goes haywire every now and then you probley have some metal on metal rubbing going on. Try loctite on all metal to metal screws also check linkage for rubbing