I'm worried about my beloved 02 Toyota Rav4. She's been a great car, we've driven all over the continent, never had a mechanical problem. Lately, particularly on humid days, my cruise control will stop working mid-trip and at the same time the RPMs start running high, nearly twice what they usually are. It lasts until I get home, next time I start her she's fine. The guys at the shop never find anything. The engine control module was replaced last year under an "extended warranty." Didn't help.