I have a 1999 Saab 9-5 with the v6 engine. The car cuts at random times stopping, pulling out, or just driving. I have had it in and out of shops and spent a good bit of money to little or no improvement. I have a code scanner recieved random misfire and an unknown code I think PO300 the scanner said code was unknown. I was wondering if anyone has had any similar problems the shops do not seem to know what is wrong.