Re: plug wire
To answer your first question, yes, you can buy a boot and the crimp from most auto parts stores. If you never made your own plug wire end, google it. There's a youtube video for it.
Second problem may be mixture (too rich, it sounds like.) Changing the needle setting, jet, or fuel to oil ratio might work.
Could be oil clogged pipe, oil soaked filter element, or..?
Or it just might be the break in blues and it'll go away on it's own.