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I have a 2002 firebird, it starts misfiring when the rpms get up to about 2500, I have replaced the plugs, wires, coil, Icm, PCM, crankshaft position sensor and the cam shaft position sensor. Any help will be greatly appreciated
The cat is knocked out, also if that makes a difference
 

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So what is "knocked out". But try misting your plug wires & coil with some water and run at night to check for spark leakage. Rev engine to 2500 to 3000 range to see what you can see.
 
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