4th generation of the BMW 7 Series / E65, E66, E67, and E68 platforms

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Engines Stalls when going over 50 miles

i am having problem when the car is lean downward engine stalling or going over 50 mile. i have changed all the coils and plugs what else i should i do. the car engine code still shows miss fire cylinder 5 7 and 8

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You may want to check the pressure on the fuel rail. You should also check the wire harness for the coil packs on the cylinders that are missing . Pay particular attention to the ground wire for the rail . with a hot engine carefully inspect the wires to the coil packs and to the injectors feel for mushy wires that blister up when the engine is hot. Hope this helps

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