1993 Toyota Landcruiser 1993 Landcruiser High Idle

My landcruiser idles ok 6-800rpm when the weather is in the 50s or below. Once the warm weather hits (it's in the 70s today) the car idles at 2200 rpm. It starts right up. Idle drops to 1100 when I put it in gear. I replaced both oxygen sensors last fall when check engine light came on. Any idea's where the problem may be? Vacuum hoses are fine.

Thanks.