ASR cars are taken over by the devil at about that age and it's very hard to get them back. In spite of all the things you've replaced there's still a lot of things to go. It's mind boggling really how many things can go wrong on these cars. I think before you throw more parts at it you should learn how to read and erase codes. This will allow you to take a little more scientific approach. You can get the injectors cleaned and tested for about $8 each - which should allow you take that off the list. The other thing I would add, unfortunately, is that you can't really assume that the new parts you've put on there are all good. You've got to keep an open mind to the possibility of a failure there too.