2006 Jaguar X-Type rough idle

Hi My x type diesel was running ok until it broke down and would not start again, AA guy told that fuel was, nt being pumped from tank and I needed a new injection pump. This was fitted and injectors cleaned refitted in same order as they came out. Car still refused to start so I changed cam and crank sensors and car started and ran fine but after about 70 miles glowplug light came on and engine now has rough idle but if icrack open injector nut slightly car picks up and idles ok. New diesel filter was also fitted. Iwould really appreciate any help you could give me, thanks