hoping somone can help. my 2005 Titan reached 100,000 i decided it should get new plugs. i purchased autolite irridium plugs (thats all that i had the money for), gapped them properly (wire gague and no i did not snap off any tips) and now i get mini misfires at idle. it just kind of stumbles randomly here and there but only at idle. I thought maybee i gapped one plug wrong so i pulled them and gapped them again to no avail. i am not getting ant CEL lite or codes. any ideas?