Intermitting fault on my ds 450

Hi I’ve recently bought a ds 450, it runs fine for hours but the all of a sudden cuts out, it starts up again but then cuts out when I pull away or try to get into 2nd, sometimes even 3rd, I think it’s fuel injected so I’m thinking it may be electrical but I’m not 100%, I’ve recently had work done on the electrics as my indicators wernt working…. Could this have anything to do with it? Also it has a fuel injection module and I noticed the cable was slightly worn I’ve since taped it up and it looks fine but could this be the problem or am I looking in the wrong place all together ? Anyone have any ideas I’d appreciate any advice thanks!!