So, I'm trying to fix my moms Murano and I cant figure out what it could be so I am coming here to hopefully get some advice. She told me a while back that it was misfiring so I drove it and sure enough it felt like it was misfiring. So we did a full tune up on it and that did nothing. I should also note that no check engine lights or anything ever popped up. So I drove it again but this time I put it in manual shift mode and noticed the "misfire" was completely gone. So now I cant figure out if what we are experiencing is even a misfire or just something that feels like a misfire. Any ideas?