[SethB]

Pulled into my parking spot at school when I got home. When the RPM dropped to idle, it started idling really rough and flashed CEL with error code P0300 - multiple random misfire detected.

A quick Google search showed bad ecu, bad throttle body, intake valves, or simply faulty spark plugs (it has been awhile since I've replaced them. Running Ngk bcpr7es.)

The threads mentioned that the car ran rough and didn't drive right for all culprits above except spark plugs. Could it really be simply spark plugs?

Also have P0455 large leak detected. Not sure if related because that code I've had for some time now and goes away randomly. Was actually in the "history" of codes.

I need some Saab geniuses here.

Thanks guys

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[SethB]

Okay just experienced a loss in power.. Turbo only made it halfway and took a bit to accelerate.

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[mcgyvah]

try reading these couple of threads and see if anything fits your problem:
https://www.saabcentral.com/forums/showthread.php?t=236677
https://www.saabcentral.com/forums/showthread.php?t=535961

 

[SethB]

Thanks for the reply!

Ended up being something super simple! I'm just an idiot and didn't find it until I checked with engine running.

Check valve in vacuum line broke:

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