peugeot 307 help please?

Oh my goodness I have just put my car in to the garage its a 307sw 1.6 and my car totally cut out and wouldn't take me above 30mph cat converter fault flashed up along with anti pollution I am worried I have now asked the garage to replace the cat when it would have been a perfectly good one :( however the car has no spark could it be it does need fixing and coil pack is needed... I feel really crap about it now all that money :( STUPID PEUGEOT I used to love them x