90hp johnson missing on wot

[lrbennett76]

hi, I have a 2000 model johnson 90 that has stated missing on wot. It seems to be worse before it warms up and misses less after it warms up. it idles perfect and runs great at half and 3/4 throttle. I have changed the plugs and It is using pre-mixed gas instead of vro. any ideas where I should start?

 

[sutor623]

How do you know it is missing? Normally the way to tell a motor is missing at WOT is that it just doesn't have the power that it used to. Did you check spark on all cylinders?

Also, why are you running your motor at WOT before it warms up?

 

[lrbennett76]

I an tell it is missing because I can hear it and feel it. the power will go for a split second and come back.