DSE.. Rough idle when warm...

Hello Landy lovers.... problem number 268.. (only joking.. ish).. my 1998 dse has started to idle really rough when warm... any one any ideas??.. ive cleaned the air filter out and a quick check around rubber pipes.. but i found 'nowt'..... any help would be great..

Oh.. I forgot to say that it runs sweet any other time than this rough idle...

mine is similar, if i watch the engine it will shake from side to side for 10 second in every minute. i reckon my pump mite be on its way out. is yours chipped?

on rave its known as the 900s, on idle sometimes the engine starts to shake then idles ok again before doing it again. mine did the same thing until recently when i had to change the engine ecu to to a fault, with the new one i aint had the problem back. apparently its a software issue that they only seemed to fix on the last models so when you order a new one they send the latest version and job done. not bad a, only costs 500 quid for that.:jaw