OK, my 92 si was running great. Until last night, coming home from work, i (obviously shouldn't have) burned the tires in first and second gear. Immediately after (keep in mind i did not redline at all) my car started bogging horribly! Its the worst thing i've ever heard. i instantly opened the hood when i got home and even had a couple people listen to it. they all said it sounded like its misfiring.
so this morning i got up and took the valve cover off to find that the oil inside is really dark. took the spark plugs out to find that they all spark but now they have a thick black sute on all of them. I checked the rocker arms. and they are all perfect. no check engine light.
I don't know where to go from here... what could have happened from me burning out like that to make my car misfire so bad so quickly

??