My LT1 will backfire from a dead STOP to WOT. Also revs slow. Can anyone help me.

 

Clogged cat(s).

 

posable bad fuel pump or clogger fuel filter

does your check engine light come on? if so can read the code?

 

I dont have a cat on my car and its not throwing any codes. Could be a problem in the fuel system but i changed my fuel filter. What else and how can i check other things in the fuel system.

 

A fuel pressure gauge is a great tool for diagnosing fuel injected engines. you can find one a most auto parts stores for around $30 to $50. Check this link out for a very thorough explanation of how to check your fuel pump, pressure regulator, and injectors for leaks.

http://shbox.com/1/4th_gen_tech2.htm...essure_testing

 

It does sound like a fuel problem..