So my daughter was driving the X5 couple of days back and the engine was not running smooth, lot of vibrations. Immediately thought of misfire and plugs needing replacement (have been procrastinating). Sure enough pulled the codes, there was a misfire on cylinder 4. So I replaced all the plugs (still had the originals NGK which were pretty worn out, but man did they last long) and the coils, all Bosch.

There was oil on the 4th plug, looks like Valve Cover gasket issue, have ordered it, but thinking should I replace with the Aluminum after market?

After replacing cold started the car, lots of vibrations, could smell gas as well, getting all kinds of random misfires across all the cylinders. Got an XDrive and DSC failure, limp mode. Have parked the car back.

What do you folks think is the issue here? Plugs and/or coils not installed properly?

Thanks

__________________
2008 E70 X5 3.0si
Sport | Prem | Adaptive Drive | Tech. | Cold Wthr | Rear Climate | 3rd Row | Running Boards | iPod/USB

2019 G30 530e
Sport | Adaptive | Drv. Assist+ | HK | HOV Access

2018 F83 M4
Comp. | Exec | DCT | First M Car

2009 E93 335i (Sold)
Sport | Prem | 19" 230 | Logic 7 | iPod/USB | Sat | HD Radio | Comfort Access | Heated Seats | Pure Joy

E36 328is GoKart (Sold)
Manual | HK | Trip Comp. | 17" Rims