lilwing

Hi all, first time to post, hope i can be clear... my '98 forester started acting funny a while ago. just a few times did the rpms increase, and there was loss of powe, as if in nuetral( itis automatic). yesterday the check engine light came on and the rpm, powerless machine was taken to auto zone in 2nd gear for a code read. got )500. replaced the vss. drove ok, but the light still on and now speedo quit. took it to advanced where codes 1507 1540 came up in addition to 0500. any ideas what i should do now? i am extremely low on funds, the $107.00 for the vss nearly killed me... thanks in advance for any ideas