2000 BMW x5 4.4 could p1351 be faulty fuel pump

Question

I'm trying to track this down my car is terrible at low rpms but seems to perform better at higher ones at low rpm it almost seems like all this 5-8 cylinders are misfiri ng but seems to ignite at higher rpm

Answer 1

P1351 Misfire

This in not a misfire cause by a fuel pump at all.This is a misfire with a injector shutdown.You provedi ts not the fuel pump by having ignite better at higher RPM. . two components can cause this , a induction problem especially with the PCV system. or a ignition coil that causing the misfire.