Mini R56 2008 Problem?

Hi my R56 08 Mini One has just had an engine head rebuild now Im experiencing a loss of power and erratic idle. Air mass flow, plausibility & oxygen s

Hi my R56 08 Mini One has just had an engine head rebuild now I'm experiencing a loss of power and erratic idle.
Air mass flow, plausibility & oxygen sensor before Cat, plausibility.
Can anyone help?

or:Hi my R56 08 Mini One has just had an engine head rebuild now I'm experiencing a loss of power and erratic idle. Air mass flow, plausibility & oxygen sensor before Cat, plausibility. Can anyone help?

Tags:engine,head,2008,