HELP!!!! My car keeps dying

If vehicle is an automatic have them check the Torque Converter Clutch Solenoid.

U can get one on eBay for way way less https://m.ebay.com/sch/i.html? _from=R40&_trksid=p2056088.m570.l1313.TR2.TRC0.A0.H0.X2003+ford+fo cus+l.TRS0&_nkw=2003+ford+focus+lx+pcm Oh yea if you change your pcm I think you have to get a new programmed key (double check)

I had the same problem so I changed the fuel filter $15, fuel pump $60, fuel pump modulator $100, checked the ground wire for that cost free with a piece of sand paper to sand where wire connected to get a good ground connection, pcv valve $ 2, and hoses $20, throttle body $20 (from junkyard off a 2001 focus that had rear end damage), mass air flow sensor $60, both o2 sensors $70 a piece, cadallaic converter $390, and checked all vacuum hoses for leaks free, EGR valve $20, and somewhere in there I fixed the problem, I think and hope ?? Keeping my fingers crossed the check engine light don't come back on, and now the other day my passenger side CV axle broke loose cost me $90 for new one, now my car will run then die out and battery acting like it's dead, jump starts then dies from just sitting turned off, needs to be jump started again to start, new battery in it, now I'm leaning towards a new alternator $160 rebuilt 1 yr warranty .... FML !!!! Grrrr !!!! Time for the junkyard I'm thinking !!!