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.

3 answers
Are there and trouble codes stored in the engine module? Do you have any vacuum leaks? How is the fuel mixture?
Possibly a cam sensor
Check your Crank Position Sensor.