As I look again:
Quote:

... and the voltage for the all 3 prongs where all the same 16-20 on low idle. defenite increase when opened up.



You need to be a bit more definitive there Willy - 16-20 is quite a big range
i.e. if one was 16 and the other two 20, that would constitute an issue.
The three should be the same within about 1V at the exact same rpm (easiest measured at idle speed)