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This is usually the result of a loose screw on the back of the PSP behind the analog stick, or dust on the analog stick receiver itself. If it is an older PSP, you can try to open it up and clean the analog stick yourself (after tightening the two screws behind the analog stick, of course) but if your PSP is newer, I wouldn't recommend it, because any attempts to open the PSP will VOID YOUR WARRANTY (if you still have one).
BE CERTAIN YOUR PSP WARRANTY IS NO GOOD BEFORE YOU ATTEMPT TO TAKE IT APART YOURSELF AS YOU WILL VOID YOUR WARRANTY.
Open PSP 1000: http://www.ehow.com/how_6085376_open-psp-1000-repair.html
Open PSP 2000: http://www.ehow.com/how_6548290_open-2000-psp.html
Sounds to me like the analog contacts need cleaning. I would take it to a shop or a specialist... If you have the proper tools you can do this yourself but from personal experience these can be hard to get contacts lined up correctly after taking them apart.
Firstly, get a screwdriver compatible with the psp,Take the faceplate off.And dust the analog section of the psp with a very soft brush.Reason why there might be dust that is malfunctioning your analog stick.Make sure you take off the analog faceplate though
your psp probobly has somthing lodged underneeth the analog stick like a pice of dirt or somthing very small.theres probly not much you can do yourself but you can take your psp to repair shops or some electronic stores that might be able to repare your psp and solve your problem...