Just replaced the pcv on my 03 s60 and when I went to turn it on the car turned on but immediate stalled, then I heard a whirring noise from the engine, closer to the fuel injectors. My guess would be that I messed up while putting them back. Any help would be appreciated.

 

My first thought is the whirring nose may be the vacuum pump (kicks on at start up to help the brake booster - otherwise you'd have a hard pedal for the first hundred yards or two...) Did you check the fuel pressure at the rail? You can try primering the rail by jumpering the fuel pump relay.