TD5 uneven idle & no pull

Can anyone advise on these symptoms. '99 TD5, running enevenly and down on power. Still starts ok, no smoke, no heat issues, nothing appears loose. Just lumpy, more noise and won't accelerate briskly - no engine management warning light being illuminated.

I have squirted two bottles of stp diesel injector cleaner in on 3/4 of a tank & have driven a 100 miles - no improvement.

Any clues as to which is the most likely cause of the symptoms before I head of to a Landy dealer?

It could be a lot of things

realy you want a fault code read to see if there is any running faults showing in the ecu

i would look at wiring loom for the ecu and injectors look for oil contamination.
it could be a sticking egr valve
it could be the circlip on the wastegate arm rotten off so you have no boost

tbh there is loads of things it can be..

regards bell

check the turbo.