Changed plugs on this about 2 weeks ago and while the weather was still cool, during moderate to heavy acceleration/load at 35-50mph, it wasn't skipping completely missing but is still surging/hestitating unless I put my foot into it completely then it seems to smooth out. Yesterday, it got up to 92 degrees here and the thing would start hestitating/missing (like it is starved for fuel), and anytime you try to put some gas to it, the engine actually bogs and slows down, it then died a couple of times, leave it off for a minute and it would start and run well enough to move on for awhile before dying again. CEL blinking again. As mentioned above, put new plugs, new fuel rail pressure sensor in the thing, new fuel filter, IM gasket. I'm trying to guess what the next steps should be...any help or suggestions would be appreciated. Here is the order that I'm currently thinking but would love some help.

1) Plug wires
2) O2 sensor
3) Fuel pump??? Just wondering as it seems to get much worse during hot weather.
4) Fuel tank screen??? I don't really want to mess around with the fuel tank for obvious safety reasons but, cheaper and easier than gutting precat or replacing cats.
4) Somewhere on the board I saw that if you disconnect the upper 02 sensor and it runs better the problem is ????something????, any help here?
5 and 6) The last 2 things I want to do would be to gut the precat and/or replace the cats.

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