recently i have been having a problem with the driver side seat back,after i adjust it it feels like its locked in place..but it will fall back with a little pressure. right now i have the back seat folded down and it holds it up. is there a gear that can be replaced or do i have to replace the whole seat? thanks in advance! 2004 sport trac xlt and a quick second question. my check gascap light is on..i replaced it with a new one and the light remains on..what else should i do?