lean condition

I'm using autotap to log my 97 Z28, and today the car has started to run rough and stumble. It is reporting a misfire on cyl's 4 & 8. I'm suspecting it is from a bad plug wire, but I haven't had time to check. My question is that now my Ltrim for bank 2 is reading 25% constantly, and bank 2 sensor 1 is cycling between 5 and maybe 300. Would this lean condition be from the misfire?

Thanks

I'm using autotap to log my 97 Z28, and today the car has started to run rough and stumble. It is reporting a misfire on cyl's 4 & 8. I'm suspecting it is from a bad plug wire, but I haven't had time to check. My question is that now my Ltrim for bank 2 is reading 25% constantly, and bank 2 sensor 1 is cycling between 5 and maybe 300. Would this lean condition be from the misfire?

Thanks

Correct, if a cylinder doesnt fire it will push all that unburnt oxygen down to the O2 sensor and look lean on your autotap.