I thought they only did touchscreens from 1986 - 1988.
Anyhow if I remember correctly, that is probably caused by a bad ground. It is a big chore, but you might want to open up the console / dash and see if any of the grounds look bad.
I think there is a place in Connecticut that will rebuild these, but the cost is probably as much as you paid for the car...
-Bob C.
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