Shake vibration Problem Help!!!

[Derivat]

Hello everybody

I have a problem with my 03 X5 , used to run great but started leaking oil and I replaced the valve cover gasket and after that the car started shaking at 35-50 mph and service engine soon light came on , took it with a BMW technician and he told me one of the fuel injector went bad. I guess he said injector number 7 , so I decide to replace all of them and the problem persist and i noticed got worse. he say also one of my ignition coils is bad and probably is causing the car to shake.

before to replace the injectors the car shook only when pressing gas but now it shakes at every stop i make

any help would be appreciate. thank you