e53 4.8is

[FinB]

I Seriously need help. My story start from this spring as I blow up my old engine. I got reconditioned one and the engine swap was made by my local bmw dealer. Everything went fine, the new engine stsrted well and runs beatifully untill..Last six months in occasionally my throughs up fault codes 2b5d cranksaft sensor, plausibility , 29d2 misfire cyl6, 29cd misfire cyl 1, 29cc multiple misfire, ofcourse after these messages it starts to flash cel light. 3 weeks a go my wife was driving and the cel light started to flash.. Usually tje trouble goes away as you restart the engine. This time it didnt help and the car was towed back to bmw stealer.. This point I must tell that I have chanced:Maf, coils, spark blucks 2xtimes, all filters,temperatures sensors, cranksaft sensor 3x times, dme box has beeb reprogrammed 2x times. The stealer suspected the engine timing to be wrong.they c checked timing yesterday and everything was ok in timing. At this point Imust say I have chance the ccv's and vannos solenoids rubber O- rings as well. Well now my steler told me that it might be the dme box or wlywheel needed to chanced.. Im out of words, seriously I dont know what to do. So far I have spent over 16000 euros(19000$) to get my car running again. Please help, all advice is needed.