I have replaced the fuel pump, regulator, egr, throttle position sensor, I am running out of options! It starts up and then almost immediately stalls and seems to have a loss of power when trying to keep it running. Please help!!!
Will it stay running if you give it a little gas? if so It may be a idle air motor (aka iac valve).
Also I was wondering if you were changing the parts you listed just on a guess, cause someone said to, or if they tested bad. Hopefully it was the last.
STOP throwing part$ at it. It's the most expensive & least effective way to fix anything. Spend that money on tools, like a fuel pressure gauge (~$35), a digital multimeter ($8-80), a vacuum gauge ($35-50), & a Haynes manual ($14 PN 36058 w/light blue cover). A screw-in compression gauge would be another good investment, but it can wait.
Another important diagnostic tool is a paperclip - use it (or any jumper wire) to pull the codes.