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probably a head gasket, check the coolant to make sure it's full, only check when it cold. i would have a mechanic do a c02 test on the cooling system to check for a bad head gasket. hope this helps.

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โˆ™ 2009-08-14 13:01:55
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Q: Why does Lexus RX350 idle very rough in gear and standing still for the first 3 minutes or so after sitting all night?
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