2007 pontiac g6 DIES WHEN STARTS security lights on radio and reduced engine power light on radio

Ok so got in the car didnt want to start got a jump
it started got a mile down the road it just shuts off
no warning  and so we tried starting it by crossing
over underneath car didnt work after this we
thought starter guy changes starter when he put
key in car still wouldn't start just click noticed the
security light was kn so locked all doors and
unlocked them then it would start but when u give
it gas it shuts off done a code reading on it says
crank sensor is bad replaced crank sensor the light
is still on and car still is doing the same thing also
light on radio says reduced engine power checked
battery charged battery still same thing security
lights are still on along with crank sensor light
checked fuses all good what can I do from here I'm
a single mom I have a seven month old not a lot of
money what can this be please help!