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It is hard to say what is happening from your description.
Is the module in control of the fan functions as well as the burner control?
On older furnaces there is usually a fan and high limit combination switch. It sounds like from your description that the high limit may be weak.
The limit switches are typically 110 vac, so if you put a meter across these contacts and see a voltage, that would indicate that the switch is open.
__________________
Bill K.
"I started out with nothin and I still got most of it left...."
83 911 SC Guards Red (now gone)
And I sold a bunch of parts I hadn't installed yet.
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