rough running issue

[JMDLee]

Hey all,
Just had my ML 55 throw a code 0170 and 0173. All information pointed to the MAF, which I replaced. No improvement, now it has given me codes 300, 301, 302, indicating random misfire, and misfire cylinders 1 and 2. My plan is to replace the spake plugs, but do you think this is more a coil pack issue? Which should be my next step.

Any insight would be appreciated.

Thanks,
Jason