sudden loss of power out ofnowhere

[raygun04]

So I suddenly lost power again and while i was trying to give it a little gas to get home it died on me and now it wont start? o.O might anyone know the problemo? I just did the valves by the way and shes been working alot better ever since I did that...I almost thought my loss of power problemo was over o.O;;;; thanks for anyones assistance