what the hell is wrong?

This 2.2i cdti is really doing my head in ive had it a few weeks now. Ive had to replace all 4 tyres. Its had a new battery, new glow plugs, new glow plug relay, new power steering hose. Ive cleaned the egr valve and put a new genuine filter on it but it still loses power and feels like there is no turbo. No codes but went out last night and it went into limp mode without engine management light coming on. Gave the fuel filter bulb a few squeezes before heading to work this morning but the glowplug light is still flashing however its not in limp mode but still doesnt feel like i have a turbo.
What could it be?

Book it in with me for a diagnostic. No point guessing.

I've had this problem in a petrol, car the first thing I'd do is use cataclean,for unblocking your cat. Try unbolting your Manny.but as the man says, diagnostics will be the definitive answer.

When you say you put a new genuine filter on it, you mean oem fuel filter? Who's been doing the work on the car, glow plugs etc?