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Rough idle

Engine

Vehicle Information: Model: 911SC; Year: 1981; Body Type: Coupe; Total Mileage: 66k;

This question has probably been asked numerous times, but when checking the oil while the engine is running,it begins to run very rough after the filler cap is removed.This is normal, right? Speaking of oil....The drain plug on the oil tank was obviously overtightened by the shop that changed the oil the last time. While changing the oil myself, I rounded off the points on the drain plug.To finish the job, I removed the oil hose at the tank and drained the oil that way, but I want to remove the drain plug next time. I'm concerned that if I use an impact wrench I'll damage the tank and have a bigger problem. Any thoughts?Thanks,Woody

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