Problems still occurring, but no fault codes

[ZetecShearer1987]

Hi everyone.

 

still having ongoing problems with the focus. Still not sorted the judder at idle or the drop of if power.

car is currently at the main dealers again and no fault codes showing, so they saying no fault and nothing is wrong 

Also when I gradually accelerate at idle upto about the 2000 rpm the whole car shakes and wobbles and feels awful. Also when the car settles back down the idle, the revs drop to about 500 then pick up to 750 again, I've noticed when the car is doing this the whole car is rough all round, lack of power and shaking at idle. 

I possibly think it's something throttle related, either the throttle body or idle control valve or throttle position, it's intermittent but becoming more the normal now.

anyone got some advice please