ford fiesta mk6 1.25 55plate?

Drove car home one night car was working fine no problème with it one bit parked it up for the night got back in it the next day, car started fine as i went to pull off car died. Started car again car struggled to start when it did start car wouldnt pull off and would not idle properly and was smoking like mad. Changed plugs , coil pack leads, throttle body, removed exhaust and manifold from engine car still doing same thing. Checked to see if i had blown head gasket up all pressure testscame up fine, checked timeing belt to see if its slipped all fine. Had car pluged into à diagnostics machine came up with Nothing. Engine manigment light has not come up... Any one know whats wrong with it??
Thanks