ECM goes on after 5 miles, no flash code, why?

D

Dave Helland

1984 GL 1800 Wagon, US 49 state emissions controls.
ECM dashlight goes on after approximately 5 miles of highway speeds, no
flashing code at module below steering wheel.
No apparent difference in drivability.
Anybody care to hazard a guess?
PCV? Oxygen Sensor? EGR? Bad connection somewhere?
 

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