I'm having misfire issue with my g35 it smells like fuel coming out from the exaghst and misfires I recently changed the tube seal ( found oil and a burnt spark plug on cylinder 5 no more oil since the fix in the tube seal ) I changed the spark plug made sure the ignition coil are good / weird properly I thought I may have a burnt valve so I tried that paper and exaughst and it wasn't sucking the paper and spitting it out just misfiring and smelling like fuel if anyone has some suggestions on what I should do next you'll be greatly appreciated


Frogot to mention I'm still having the misfire on cylinder I changed the tube seal on ( 5 )

 

Compression and leakdown test time.

In the meantime you can swap coil packs with another cylinder and see if that cylinder starts misfiring.