Lumpy Engine 307sw hdi 110bhp

[wibbers]

02' Peugeot 2.0 hdi 307 sw (110 bhp).
Recently had some issues with this car. I'm happy with it, but not with the following issue!

I had a new flywheel (single mass) and cluth fitted, all peugeot OEM. Ever since, it has been very lumpy on a constant throttle more noticably at 30 - 40mph. Engine isn't "hunting" at tick over as such but when I reversed back onto some ramps a few weeks ago, you could hear the engine "hunting" up and down ever so slightly with a bit of throttle applied.

Had P0246 fault code - Intermittant turbo pressure - latched during diagnostic check. Peugeot main dealer replaced EGR valve and turbo solenoid valve.

It's not as noticable as before, but is certainly still there. After 10 or so miles, it's sometimes just as bad as before.

Apart from this issue, the car is fine.

I'm wondering if a pipe has been pinched and has split slightly. Either causing air to leak under pressure or vacuum??

Would appreciate any advice please.

Wibbers