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Rough Idle and Engine cuts Off

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I have a 99 Boxster and just started experiencing rough idle on start up. The Idle will fluctuate and after a few minutes the engine will cut off. At this point, it is a struggle to start the engine again. You can turn the ignition but it will not start up immediately. You have to keep trying several times and then it may start. Even after it starts the idel is really rough and eventually just shuts off.

The only code I have on the car at this time is P0446, which I do not believe would cause this problem.

I did just recently replace all 4 O2 sensors.

Has anyone experience this sort of problem? Any assistance would be greatly appreciated.



99 Boxster

83 k miles.

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P0446 EVAP Canister Shutoff Valve (Function) - Below Lower Limit

I would certainly investigate the reason for this code first.

Aside from that it could be fuel system related, electrical, or crank position sensor.

Perhaps a very bad vacuum leak and/or gummed up idle air control valve.

Edited by logray
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