Pressure test the fuel pump
How do you go about doing that? Connect a gauge to a fuel line and run the pump in diagnostic mode?
if you have a wide band do a WOT run and look at your afr's if your running lean chances are your pump is starting to crap its self.
I JUST got a wideband but don't have a bung in the downpipe to put it in yet. I really need to get that done.