x5 misfire faults

Hello, everyone. Please help me find out why does my 2004 X5 N62 4.4 is misfiring. At first, is started after I had to fill up with 87 gas instead of 93(the gas station did not have anything besides 87). It has been over a year since then. I did replace all spark plugs, did not help. Found one...

Hoping someone may help - I have a 2006 X5/4.4i with 60K - receiving faults on all 8 at startup - replaced plugs, moved coils to test, replaced air filter, replaced air mass, added ground straps to coils - air mass helped - car falts at start up, faults stay on till cleared. Usually warms up...