I have a problem with cutting out on my focus it's been doing it for the last 3weeks now. and it's getting to me

it's cutting out when I put my clutch in. when driving coming up to junctions also when clutch is pressed when rolling .

it don't cut out when I'm just sat there idling.

I didn't have the problem before I bluefined it.
I have tried to learn it how to idle again by loading car up things like that also disconnected battery for a night. changed battery and also changed idle control valve.
and looked for boost leaks


what's next.... need idea's please