1999 BMW 740 need help

Dear sir, I got bmw 740i 1999 model year car & I have a lots of problems with that. Starting last month he getting stalle. Sometimes while runing engine shuting down automaticaly, sometimes engine stalle no accelaretion this happen also while running then I turn off the engine & start again. After that it's become normal again. Runing well for another few days. Then after few days same happen again. Also MIL indicator on. Then I try to diagnos the vehicle.I use bosch kts650 diagnostic tools. Then I saw some diagnostic trouble codes. 33 camshaft control bank 1 faulty, 34 camshaft control bank 2 faulty, 115 air-mass sensor signal too low. I replace the camshaft sensors & mass air flow sensor fuel pump & check all the wiring system. Then I did road test. But problems is still the same. Please sir I hope from you good information that I can fix my car well. Thank you