i have a 93 prelude with the f22 sohc in it. the engine's rpm started jumping like crazy like going from 3k to 0 then back up and the engine started backfiring. i popped the hood saw oil was leaking from the header then took out the spark plugs and saw that the spark plugs area were drenched in oil...now i know that's not good at all. so what could be the problem? i figured a head gasket leak...but anything else?