what causes rough idle, overheating
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2008 Honda Accord Question: rough idle, overheat
Answer #1DaveJHM June 13, 2011, 22:08Master
Rough idle can be caused by an engine misfire, a vacuum leak, or some kind of internal engine issue - like valves that have excessive clearance and need adjusted.
Overheating can be from a faulty sticking thermostat, a cooling fan that isn't working, or some kind of coolant flow issue. It can also be from an internal engine coolant leak.