95 firebird lt1, 306 cam/heads etc. Anyways, the car runs good sometimes but every few minutes it stumbles and the exhaust changes tone and kinda rumbles a lot. I can put my foot to the floor and it barely accelerates. Hooked it up to my friend's scanner and it said it was running extremely lean (4 or so on the o2 readings). Also my headers are getting white and I have some knock. The motor is new and so are the o2's, spark plugs, wires and I just put in a new fuel pump and filter yesterday too. One more thing it does if this help is that it takes forever to get this thing to start now. But, if I prime the system a few times it starts right up. Anyone have any ideas? Sorry for the long post.

 

White?!?!?! White, as in white hot, type of white?

If so I'd guess a clogged CAT.

 

yeah it's weird looking. Could a clogged cat be causing me to be lean though? I understand the stumbling and jerking when you get on it with a clogged cat because it happened to my other car. But I think I'm still having some sort of fuel problem cause it takes forever to start it in the morning

 

What is the fuel pressure?