See a pro.
That doesn't make sense! Plugs are not fouled after shut down unless you have multiple injectors leaking. Which is very unlikely. Make sure that the plugs are the correct specification for your engine. Yes O2 sensors are a common problem on a vehicles this age, although there are several area's which may cause your engine to run rich. Have your engine tune checked by a trusted professional. I doubt you'll be up for big dollars.
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