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Not redundant at all.
The AFM is used for fuel metering. The TPS on your 83 will have idle, and WOT contacts, there is no part-throttle variable resistor like there is in other models/vehicles. So, it tells the DME when you're really stomping on it, so it can advance timing, and all the other little goodies that the AFM can't, as well as it tells the DME when to lean things out for idle (keep in mind idle AFR's can get pretty lean). Also, the TPS tells the DME when to use the idle stabilizer.
If it runs better with the TPS unhooked, the first thing you should do is check out the instructiosn on Clark's garage on how to check/adjust your TPS, and if it's no good, replace it.
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2010 Hyundai Elantra Touring, GLS 5 speed, Indigo Blue Metallic. 2.0L of Korean fury!
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