I have a very irritating problem with my Peugeot 206 HDi 2.0 (90HP) year 2000. Generally I was very happy with the engine, but couple of months ago it just turns off while driving on motorway and I put it on 4-th gear, released the clutch and engine spins at high RPM but did not start. Feels like I was run out of fuel, but I have just filled up. I've puled out, tried to start the engine again with no success. It sounds like there is no fuel. I've tried to start for about 20 times and gave up. 10-15 minutes later just decided to give it another try and it started straight away with no sign of any failure. Engine runs smooth, no unusual noises, works perfect, drives well and so on for next 2 months. Then all this repeated again. Another 2-3 months goes well, doing 400 miles every week. Yesterday engine cuts off again while I'm waiting on the traffic lights. This time I pushed the gas pedal to the metal and turn the ignition key and it started, then cuts off few traffic lights further, and so on, 10 times in 1 hour journey. I have noticed that when it turns off by itself can't start if I'm not pressing gas pedal, if I turn the engine off with the key, next time engine starts without pressing the gas pedal, and it starts very well.
I think that this could be problem with engine idling, because most of the times it cuts off while idling (pressing clutch, or change to neutral)
Also I've noticed that 1-2 min before engine cuts off it looses power for a second (like I'm releasing the gas). And while idling RPMs now jitter (varying between ~750~850) before couple months RPM dial stays firmly at ~800 RPM).
Additional info: No oil consumption, No Engine management light, No smoke from the exhaust.
I'll be very grateful to hear any suggestions what it could be.
Thanks in advance.