Man, get that kerosene out of your car and get some gasoline in b4 you freak out about the opti. Kerosene probably wouldn't be a good thing, I wouldn't think, and might foul your plugs up really well too (you've seen the black smoke from diesels, now imagine all that carbon on your spark plugs) Pull one and see how it looks, get the kerosene out, put some gasoline in, if your plugs are fouled change them, and then worry about your opti, since you definitely will need to check on all the other stuff anyway. Do it first, it may save you the hassle of the opti-satan swap.

Hope this helps---J.Bird