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Just something to try:
With the wipers in one of the positions that works occasionally, hold a wire against the motor body and a known good ground.
This will eliminate any issues in the ground circuit.
If this fixes the intermittent issue, then just install a permanent wire to ground with a couple of ring terminals. You could probably use the ground that the hood light uses.
Also, double check and make sure that you have the right wiper control module -- There are two different part numbers with different applications.
Hope this helps.
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