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yes that is normal to not run smoothly with the oil cap off. That is why when the oil fill tube leaks, the car will run like crap, but looks normal.
If you are not using excessive oil or leaking oil into the throttlebody or as a mist covering the motor the aos sounds fine. There realy is not way of telling for sure if it is getting weaker. it is usally a failed-or not failed thing. Thats why it is advised to replace it as maintance every few years.
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2002 S
Pedro rear stabilizer bar, CF strut braces, Maxspeed headers with 100 cell cats, Fabspeed cat bypass pipes, H&R springs with M030 setup, TRG rear links, EVO air intake, B&M Short shift kit, Raby IMS upgrade, Raby underdrive pulley
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