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Q: Check engine light comes on when driving over 50mph and over 2000rpms on 1993 Ford Explorer

Rookie cbe0621eac06868b3efe0d8d1d3611e23c60d3114864ea2ec19a68cfbd3eebab
My check engine light comes on when I reach 50mph on the freeway. If I slow down and let the rpms get below 2000, the light turns off. Around town it's fine, only happens on the freeway.
(3) Answers
Need to get the code that is being set by the check engine light, it will be there in the computer, even if the light is not currently illuminated.