Help I’m a my wits end my nav is belching out heavy black smoke and has no power, so far I’ve changed injectors, turbo, maf , Map, crank and cam sensors the throttle body fuel pressure sensor on fuel rail, suction control valve, the egr is blanked, changed inter cooler and pipes, boost control valve,replaced the 3 vacuum pipes from the boost control valve still no difference, it get slightly better if I take the pipe off the turbo actuator, I’m lost now any help would be appreciated, thanks