running ruff and backfiring

dano said

I always thought backfire thought the exhaust was from ignition. Have you gone over it? Check plugs, wires, cap, rotor, timing static and dynamic, wiring etc? I'd pull the plugs just to see what is going on. Vacuum gauge hooked up? Hopefully you have a boost/vacuum gauge. Where is the o2, post or pre-turbo?

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I've checked it all, the plugs are all a nice almond color except numbers 2 and 8 which are more darker. The distributors metal electrode on the rotor had some black marks on it, sanded them off and sanded the button. Going to see if that does any thing tomorrow. The O2 is post turbo around 18" down stream. my fitech is reading around 12 hg at idle.