dogbone motor mount on the lx. i have a 92 replaced it now its fine. se its normal for 4th gens idle to be higher when started and drop when shifted out of park. iac valce sounds correct. little screen in there gets dirty, if it only idles rough at start up then smooths out after it has warmed up. the light issue there is a box in the taillight assembly that may need to be replaced i dont know which side i have 2 since i have a spoiler one is white the other is brown. relays i think that is what they r called. just take the access trim door off in the trunk u will see it, easy and affordable to replace yourself.

cv joints can cause the vibration along with pulling. if its only noticeble when u brake then its possibly warped rotors.