DDImpreza

here we go i have a 99 rs i have a short ram intake apex n1 exhayst and the apex superafc. my car has been in the body shop getting painted for about six weeks. i got it back today and on the way home the car stalled out. i got it home and disconnected the battery. hooked it back up and it was bogging out. so after letting it run for about half an hour it seemed to be fixed when i threw a check engine light... now my car idles good but it wont rev over 3500rpm?????? it bogs out at that rpm in every gear. but the idle seems good for a little bit but then it sometimes stalls again. HHHHEEEELLLPPPP??????? any ideas i think maybe the mass air flow sensor or maybe the apexsafc???