Problems with the engine in our Opel Omega Carravan 2.5 V6

Hello together, turn me here with a very urgent question to you and indeed we have our V6 for six weeks and the first four weeks he ran nicely round and we were totally satisfied, but for about 10 days he is not running properly, very restless! We had the suspicion that a marten has eaten something and had him there also in a free workshop! The marten was definitely inside (hairs were found) but really have a mistake or defect they ni The spark plugs didn’t look so great anymore, so they were renewed just like the ignition cables! Everything nice and good but it still runs restless! They told us it could be on the ignition module but that wouldn’t be sure! Have I read in here a little bit and found out that there might be a lot more of the triggers! By the way, he does jump in without any problems, partly he’s rusty when giving gas! Does that speak for the ignition module? W He has experiences with it? Would you like to exchange this module next? Or maybe he will do otherwise? My husband is rather perplexed at the moment, so I turn to you and hope for your help and experiences!