'01 c320 misfire issue

[VWguy]

My Lady friend has a 2001 MB C320

cat was rattling and was having misfiring problems, replaced the DS cat, missed still on the way home from the shop, but then it stopped for a long time, now it started again

cold starts W/ hard acceleration

hard acceleration

bad idle synonymous with a misfire problem

check engine light flashes obviously

my VW scan tool gets generic misfire codes, problem is intermittent

any ideas from you guys I am completely unfamiliar with these MB's and need some help, thanks in advance

TRON aka VWguy