Renault Escape 3.0 EGR Issues

Hi all.

I have 54 Plate Renault Espace auto 3.0 Litre Diesel.
Engine code: P9X
Customer has said since I replaced timing belt this problem has appeared the car will start fine from cold when it gets warm it stalls when approaching a junction or when slowing down coming to a stop.

Code in CLiP is for EGR loop correction.
In data in CLiP EGR voltage does not alter.
Also injector correction shows no data.

I have drove vehicle it may take up to 10 miles for fault to occur when it stalls it is difficult to start and will only stay running if I hold throttle to keep revs to over a 1000 rpm could this be EGR stuck open? Not an easy one to take off.
I don't think this is a timing issue as I thought it would happen all the time.

Any help appreciated.
Many thanks Tony.