Common 87 Camero Ignition Failure When Warm

Hi,
My brother has a problem with his 1987 Chev Camero. When driving his car, after it warms up, the car will stall, and it won't start until it cools off. There is no spark (tested) when this happens.
He replaced the ignition module, but the problem remains. What is a common cause of this problem for this 1987 car?
Thanks in advance, Brad
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