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I had a similar problem a while back, and replaced everything you had replaced. I would try taking a look at the plugs, wires, dist. cap, and rotor, and make sure all looks good. Make sure cap isn't cracked, and make sure roter doesn't have burn markes or look really nasty. My next guess would be a fuel pump. Mine went bad in my 1990 GMC Sierra 3/4 ton and it ran like total crap. I would try checking the above and maybe even purchasing another fuel filter before tearing into something major. It's all about the process of elimination. Good luck!
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