Bobbybee

Good evening folks, Having issues with my Q7 with the following When accelerating hard anything over 2500 rpm and Glow plug light flashes and car goes into limp mode P008701, once shut off and restarted all ok until next harder acceleration. Replaced Fuel filter, Replaced Fuel rail pressure sensor, replaced Fuel pressure regulator, Replaced Main battery and coded to car. Injector #4 was grossly overfuelling, replaced injector and found copper washer and seals missing. Having done all of this I still have the same issue and less hair! I think the only thing now is the HPFP? Any Ideas??? Car began playing up today intermittently not starting, Put booster pack on and eventually started, and was ok for a few starts then intermittent no start. This along with the new gear selector issues below. Gear selector locked up numerous times in Park, cleared faults and always ok until I go back into Park then It locks up again. Been a brilliant car but now driving me nuts lol. ANY IDEAS OR ASSISTANCE GREATFULLY APPRECIATED ON ANY OR ALL OF THE ABOVE ISSUESTO GET MY SUPER SMOOTH Q7 BACK. COULD ANY OF THE ABOVE BE LINKED?? Cheers Bob