Chugging when slowing down

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didn't want to use the forum as a platform - also concerned about how to conduct such a conversation in case my comments get shunted but this seems like just the ticket...
 
It has a solid Engine - Diesel of course - pulls well and rattles along nicely. Had those three pesky signals on the dash recently but easily sorted so full steam ahead.
 
just coming back to this for any further non-train related suggestions?! Engine only does this sort of chug chug chug noise when coasting, ie when I take my foot off the big pedal and glide along serenely - does not do it if I rev the engine when stationery. Someone suggested it was something to do with unused fuel - but I'm not sure I understand that. Could it be something to do with the engine tuning? Am about to take delivery of a Nanocom so any advice on what I could tinker with would be much appreciated...
 
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