I start the car and runs really rough and eventually dies out. Other times it starts up and runs perfect. I've redone afpr, cleaned out injectors and they all flow the same TPIS did that work for me. The feul pump and filter are working and ok, no codes coming up at all. What is causing this or where can I look for other trouble shooting techniques?

 

http://shbox.com/1/4th_gen_tech2.html#opti_test

Good luck.