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Q: Engine on 1990 Jeep Wrangler

Rookie cbe0621eac06868b3efe0d8d1d3611e23c60d3114864ea2ec19a68cfbd3eebab
Why is engine sputtering at high speeds? Oxygen censor has been replaced, tune-up has been done. Thank you if can help
me out.
You should have the fuel pump (pressure and volume) checked and the ignition system. Either of these could be your problem. Also have them check for a plugged exhaust system.
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