2000 Explorer XLT 4.0 L Irregular idle

Upon start up my 2000 Explorer revs up and down until it stalls. This only happens when the engine is cold and the outside air temp is below

60 degrees. In warm weather it runs fine. I've replaced the mass airflow sensor and had a mech check for vacuum leaks, but still no luck. Any ideas? Thanks.
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joey.wolfe
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riddles

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