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the list of things that could cause this is huge:

1 OMP is bad and your engine is over heating/starting to seize.

2 Catalytic converters are getting clogged and restricting air flow

3 Vacuum lines are bad

4 Air intake is sucking in hot air

5 Engine needs a rebuild

6 Transmission is out of fluid

7 electrical short

8 Battery is old and overheating

I would start with replacing the battery and then have a shop take a look......

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Q: 1990 Mazda rx7 losses power after driving a while?
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