So just after putting a fuel pump in my 95 camaro with a 3.4L it started acting odd. When its cold and at WOT it misses and has no power. When it gets warmed up its a little better but sometimes it has the same issue...no power. I have changed virtually everything, new spark plugs and wires, new coils, fuel filter.
Anything you guys can think of that I should check?

 

check the fuel pressure aftermarket fuel pumps are a gamble yours could not be cutting it

 

sounds good!

 

You getting any codes?

 

No codes at all. I have no lights on

 

have your injectors cleaned and flow tested. test your knock sensor.