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I don't think you have to use the 5 speed ecu...not positive though.
Your idle issue could be due to your TPS. Try resetting your idle.
In addition, I don't think the 91 ECU would work...too many different sensors between '91 s13 and '98 s14. If you swapped all of the sensors (engine and tranny), you still may have issues with the cluster and HVAC.
Maybe someone else will chime in.
A word of advice...the more legible your post, the better your chance to get an informative and helpful reply.
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