lol....

my lt1 was giving problems similiar to that... it ended up being the sock (filter) on the internal fuel pump.... I would go through everything else that they say *first* like opti, because my fuel pump was not easy to get to.. and no fun at all...

my car got so bad after running for a little while it would start to break up even at idle.. if yours isnt doing that and only breaking up when reving it probably is opti...