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1986 Rough engine Idle after driven

Engine

Vehicle Information: Year: 1986.5; Engine (size, modifications): 5.0 liter; Total Mileage: 130000;

After driving and engine has warmed up and I let it set for around 15 minutes I restart and the idle is very rough and will die if I don't keep the gas depresed this happens with it in gear or in netural or park. It clears it's self up about 30 seconds after running in gear at normal speed. No power loss after it clears up. This will happen again if I leave it set hot for another 15 minutes. If it sets over night it works fine.

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