a few things to check. Have a look at the red plug on the ecu and check for oil.
Does your fuel pump sou d any different? my td5 will start and rev when the pump.is dying but has no power and is rough as feck when trying to drive it
Can you hear the pump running when you turn the key ? Before you start it.
Thanks for your replyCan you hear the pump running when you turn the key ? Before you start it.
Filter change twice and still the sameThat's a good sign but if in doubt its a simple cheap swop out and defo check the filter
Filter change twice and still the same
Could it be fuel pressure regulator or fuel return valve