BenRice

If it already had Yellow Jacket's in it then someone's encountered this issue before and tried to fix it.

When you swapped the plugs, what did the old ones look like? Black? White? Or all different?

Check the grounds for the coilpack harness - not just the connection, but the wire in the terminal might be cracked. Better yet, run fresh grounds from the coilpacks, even temporarily to check if that's the issue.

After that, throw a fresh fuel filter at it and double check the voltage at the fuel pump

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