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After reading the other thread my thoughts are, have you taken a log to see what your mixtures are doing at high rpm? If its injector related I would imagine you would see something there.
My second thought was you said you are stock except for the SC, does that include your exhaust? If so it might be worth inspecting your cat converter. A partially blocked cat might cause a misfire.
Lastly, have you checked the grounding wires for the motor are clean and undamaged? Poor grounds can cause all sort of issues.
And yes the fuel filter is basically a sock on the bottom of the fuel pump.
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