hi soulhaj,
Can you please post your system specifications? If you don't know them, go to start - run - and then type dxdiag, then press enter. If a message appears, click ok.
A new window should pop out, that's where you can find your pc's specs, then tell us them.
As far as I know, Fifa 98 is very slow on emulators, maybe this is an emulator core problem, graphics plugin problem, or is a game with a high system requirements, I really don't know. I will surely know the answer by next week, when I buy my new graphics card. I have a very fast (AMD 3500+) processor, so, if after I buy the graphics card the game is still slow, then it's PJ64's problem, being graphically or core, but if it gets fast, then you've got to have a dedicated graphics card to run the game alright. I'm still wondering why haven't this game appeared in the latest RDB.
You can get the cheats for Fifa 98 here:
FIFA Road to World Cup 98 Cheats - FIFA Road to World Cup 98 Codes - FIFA Road to World Cup 98 Secrets
I don't know any gameshark codes, though.
Also, the next time you post a message, we will appreciate you to type more clearly, as it will help us cover and understand your problem. If english is not your native language (in my case too, but I can type good, understandable english) then try to use some translator tools, like google translator and babelfish. They're not great, but are very helpful sometimes.