I have a 99 ZX 750 it's set for year before I put an 03 motor in it after putting the motor in it it ran an idol and would rev but was falling on his face when written a check inside my carburetors one of my flow bowl pins was old and falling apart I replaced all of them with new and now it will not run some people have suggested that it might be vacuum lines but I am not really sure if anybody could give me any suggestions or help it would be greatly appreciated