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The ignition pickup and trigger wheel on the '82-'83 models is inside the distributor. Check the distributor shaft for play, and look for possible contact marks where the wheel might've contacted the pickup, indicating worn shaft bushings. Your ignition pickup itself may be intermittent as well. Since you say that it is backfiring at different times and rpm's, I would lean towards an ignition problem first.
Have you done any other regular maintenance lately like fuel filter, cap/rotor, plugs/wires?
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