VN Rough idle

Hi, have a VN Holden 3.8 v6,had a slight ticking noise that I put down to a sticking lifter, well the other day I went to start it and it just went clank clank, wouldn't turn over, so charged the battery, still the same, took out the starter and tested it, all ok, got back under and turned the ring gear by hand,(was easy moving) put it all back together and it started, straight away, but with a new problem, now the motor runs very rough on idle and motor seems to shake and is still there on revving, oil pressure seems to be good. Does anyone have any ideas what could have happened, given the facts I have just stated, motor ran perfect before, has done 180,000km

Thanks...