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Q:

engine cutting out/serging while under a load on 1992 Toyota Paseo

Rookie cbe0621eac06868b3efe0d8d1d3611e23c60d3114864ea2ec19a68cfbd3eebab
this happens while driving at freeway speeds, also while driving 25 ~ 60mph
(1) Answer
If you don't have check engine lights, I would suggest getting your catalytic converter checked for possible failure.