Technical Intermittent power loss

[Bellyh16]

Can anyone shed any light on what may be causing a low power (acceleration) on my fiat ducato 130 multijet

I have had a number of basic things changed including

Oil and filter change
Fuel filter change
Air filter change
Water pump and timing belt done recently (needed doing)


Symptoms
Very fuely smoke on start up clears when engine warms
Occasionally when starting up it spluuters and bogs out i have to push the accelerator down to get revs up
Often rough idling on start up after a journey
Although if left overnight starts up great with no rough idling
Poor fuel economy
Lack of power when accelerating
Sometimes when revs pass 2k power seems to kick in a little but not all the time
I've noticed that if I take it for a run at 3krevs for a few miles engine power seems to be restored somewhat

it is not in limpmode as revs are never restricted and never get any EML

I have no engine management lights on the dash and when plugged in no pending codes

Hey everyone.

I am still suffering from above issues so have just bought a multiecuscan to recored live data and also see if there are any hidden codes ect it may pull up

I must also add that after taking it to another garage with no further result I was told it looks like the dpf has previously been gutted and egr capped with is really not sitting well with me !

Could this be a possible cause of the above symptoms?

Also when the multiscan arrives this Saturday what shall I look at in reference to tests and also live data.

Many thanks
Harry