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87' 740 Has Intermittent Fast Idle When Up to Temperature 700

Every tenth time or so when the car is at operating temperature, the idle will be at about 1800 RPM instead of the usual 900 RPM. After it cools off and is started the idle will be back to normal at 900 RPM. It has about 221K miles on it and otherwise runs fine except for an occasional miss. Any ideas what could be causing the fast idle problem? Thanks in advance.






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