I do not perceive misfiring during running but I can precisely ear them on idle. Car is shaking random and misfiring is clarly audible. Bank 2 is misfiring in each cylinder -4.5.6-. Furthermore, first range of rpm, util 2000, are very shaky then the engine becomes regular. But still have no pressure in the tank. Could the venting valve stuck open let the engine breathe air from it?

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That would cause an oxygen sensing fault. What faults does your car have and which year is your 911?

- Casey