Mercruiser 350 MAG MPI missing only at 3000 rpms

[Bondo]

Ayuh,..... Looks like it's runnin' lean to me,....


Btw, don't keep starting new threads 'bout the same issue,.....

 

[kevinwatkins2003]

Here are some different photos of same plug. The porcelain insulator is definitely clean. If agree I have heavy carbon/oil looking deposits on inside and outer.