1997 gt Conv. Lim Ed. Radio problem Options

[njccmd2002]

I have a 1997 celica, that has the stock radio. Sometimes the front speakers dont work sometimes thy do. Is this an amp problem or a radio problem. Is the posibility that i need to replace the amp. Its a very rare form that is no being sold on ebay. I want to also exchange the radio to a 6 disc OEM toyota. What year reange can i look for, and what can i do to check the amp. Is this a normal problem. I wish to keep my car Stock, dont want aftermarket. Thanks in advance,

[njccmd2002]

I have the stock amp, its not the jbl, but it is the 6 speaker version.

Pretty much the amp looks like this.

http://cgi.ebay.com/ebaymotors/1995-Toyota...sspagenameZWD1V

(cut and pase into browser if you cant click).

I was thinking to cut the wires and hook up an amp to the stereo i have in the mean time i get my 6 disc in, cause i dunt know if the amp is wrong. It acts up, sometimes the left front speaker works, sometimes the rignt, sometimes both, sometimes never. The back speakers always work. I have cheked for shorts but i cant see none. I m temepted to open the amp. anyways. Any suggestions on what years will fit on my car, thanks.