Let's start.
This game need 333MHz.
First of all you need to load the game

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Wait untill it fully loads

When you are there you can launch FuSa.

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Enter HOME screen.
Remove cable and then activate FuSa by holding (-) & (+) volume buttons.
Insert cable and then switch to TV by pressing vol. (-) & R-TRIGGER

Now you can play it on TV's screen, but it's too slow
So you need setup priority n FPS.
At first you should setup priority.
Enter FuSa's menu n choose priority setting.
Hold R-TRIGGER to increase scroll speed (10x), now press RIGHT one time - priority will be changed to 86%. Now release R-TRIGGER and press LEFT three times - priority will be changed to 83%
83% is optimal priority value for GTA: VCS n FuSa_1.0.45.

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HOW TO COMPUTE OPTIMAL PRIORITY VALUE
1) Set maximal priority to 99%.
2) Check if the sound stammers.
3) if the sound stammers - decrease priority and return to action 2)
If sound doesn't stammer - congratulation, you've found OPTIMAL PRIORITY VALUE

OK, now when you've done with priority let's skip to FPS.
Enter FuSa's menu n choose FPS setting. Now increase its value untill game will run fine.

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When you reach some value's range, the game will not react to FPS setting - this is optimal fps value.

For GTA VCS it's 20-30 FPS (26f is optimal)
Now we've done, enjoy the game and don't forget to save optimal values somewhere (for example in your head :D)

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Switch to PSP's screen before exiting to the XMB by pressing vol. (-) & R-TRIGGER