I have oil in spark plugs
You have leaking spark plug grommet/seals under the valve cover, and most likely being a 91, also have leaking cam tower o-rings. The first is just a matter of replacing the valve cover gasket set. The second requires removal of the cam tower/rocker arm shaft assy. to access the o-ring seals between them and the head. If you are not an experience mechanic, I do not recommend doing this yourself. It is easy to damage parts and bend valves if you don't seat it properly.
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