My Saturn engine dies more and more often. It happened starting around one year ago when I waited for a traffic light. I had to restart it. And then, the engine dies more and more often. Usually, it happened when I made a turn and waited for a traffic light. These days, even during driving on highway normally, the engine died sometimes. However, I can always succeed in restarting the car (sometimes I had to turn the key several times).
A mechanic checked my car, replace the four starter plugs and fuel filter. The problem wasn't fixed. I knew that catalytic converter of my car was also broken. The mechanic told me it could be the problem of "catalytic converter". But I am wondering "catalytic converter" can cause engine die during driving.
I do greatly appreciate for any advices or possible solutions to this problem.
Thank you very much in advance.