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Just a shot in the dark.
Check the connector to the air mass meter. Not sure about the why but in MT cars, when disconnected, the upshift light will flash at a regular interval.
That's based on my own experience and seeing it reported here by others.
Not suggesting that yours has come off completely. You would notice a big difference in running. But maybe it has worked itself off a bit or is dirty.
If that's not it, maybe reset the LH ECU.
Well, you said any input...
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'80 DL 2 door, '89 DL Wagon
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