low rpms

  1. T

    low rpms at 60 mph

    my manual 02 sunfire started to slowly overheat at 70 mph, cools down at 60mph but the rpms seem too low... it cruises at about 2100 rpms, if I drive at about 50 mph its too high on 4th gear(2800) and if I drive it on 5th gear its too low(1900), any suggestions?
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