Noisy Td5 1999 auto

Hi
New to this, Recently aquired 1999 Td5 gs auto(my 1st landrover and 4x4).Problem being its very noisy in low gear and slow traffic when accelerating(when engine idle and reved seems to be missing/sluggish as if dirt/blockage possibly) , although the disco pulls and accelerates beautifully? with no smoke and engine temperature fine. Also autobox doesnt seem to change smoothly at required revs although again this can be intermittant.
Would be grateful for any possible causes or advice.
Many thanks

sounds to me like you got oil feeding back down the wiring to the ecu, check the plug's to the ecu if there's oil on them you'll need to change the wiring loom the the injucters under the rocker cover, i had this problem on my td5 & the guy at the garage told me that it was only running on 4 out of the 5 pots, when i changed the wiring loom it was like a new engine

Could be the EGR valve stuck open. Mine is much quieter since I blanked.