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Hey 5.0 drivers I need your help. I have a 91 lx coupe 5.0 that has me stumped. When I am driving at night and turn either my ac or radio on my engine loses power and starts missing or backfiring. I replaced the coil, wires, plugs and the distributor. It ran okay for about a week and started again and I just can't figure it out. My vacuum lines are okay and the pressure is fine. Any suggestions
 
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