seems like cylinders shuting off gradually. on 1995 BMW 740iL

1995 BMW 740il 4.0, starts fine then immediately a few of the cylinders shut down. have checked the compression, changed coils, plugs, has fuel pressure. donot know whats wrong. car has 93k miles.plz help. thx.

Asked by for the 1995 BMW 740iL
Are there and trouble codes stored in the engine module? Do you have any vacuum leaks? How is the fuel mixture?
2 more answers
Check your Crank Position Sensor.
Possibly a cam sensor