I have a focus 1.6 TDCI 2006 (97k miles) which has been lacking power and stalling when I go to set off, no lights are coming up on the dash but I’m getting the following codes.:

P1402 – Exhaust Gas Recirculation Metering Orifice Restricted
P0299 – Turbocharger A Underboost Condition
P193B – Throttle/Pedal Signal
P1936 – Clutch Switch/Sensor Signal

I’ve taken the EGR valve off but it wasn’t clogged, just had a thin coating of soot on it. The 1st 2 codes keep coming up after I clear them, the last 2 have only come up this once. Does anyone know what could be causing this and advice on fixing it?
Thanks