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Most of the time, idle is bad because the user has done something to the car. I have never seen a case where the idle just goes bad over time.
One more major cause is air in the coolant. The coolant system has to be bled out properly. If not, air pockets cause very strange idle things to happen.
The other thing I dont' see on your list is checking the plug order. Make sure the spark wires are plugged into the dizzy and the head in the right sequence.
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