replace valve cover gaskets and now engine has vacuum leak can't find

I found a half circle shaped rubber gasket not properly installed so we reopened the upper motor again and did the WORK. after putting her back together she still sputters by at higher rpms she sounds fine. OBD says misfire on number 2. Checked plug it had been firing fine no sign of fouling. It sounds like its hitting on 4 of 6 cylinders. How do i check coil packs or electrical signal on 2001 suzuki grand vitara limited edition 4x4. ??? Ruling out electrical and sensors would narrow it down to more simpler reasons....no?

IF you are able to swap coils from #2 with ine from a cylinder that is not misfiring , that would be the ideal way of ruling that out. Also , do you have a vacuum gauge and a compression tester? If you are unable to do the coil swap method , maybe just as easy to rule out valve and ring problems as a possible cause. Google 'gregs engines' for some excellent diagnostic tips on those last two items!

Ill do that this weekend and get back to you....thanks and sorry for all the lack of experience. Im a common sence mechanic not a pro. Lol