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In our investigation of the Evap Canister operation, I found that both ports of the evap canister are attached to the intake and throttle body. If one of the lines between is cracked or if the canister purge valve is defective, this could result in a vacuum leak to the intake system. I don't know if the 88 Duke has a canister, but you might try disconnecting and plugging the two lines that go to the throttle body and intake to see if the idle calms down. Just a WAG.
AC DelcoI did notice that the heat shield was missing on the ICM when I replaced the coils. It seems to be impossible to get, so I made one myself from coke cans (made mine 3 layers).
So what negative affects could the missing shield cause? Hunting idle perhaps?