Wow! dkthree, your post could have been written by me, except I bought the fuel filter but haven't installed it yet. I also have not changed the pump. My problem also started shortly after installing new plugs. I was certain I must have knocked off a vacuum line, but apparently that is not the case. I guess it sounds like the fuel rail to intake gaskets are where we need to go next. I just don't understand why both banks showed up at the same time. Let me know if you get yours fixed first. I'll post my progress as well.