Quote Originally Posted by gsrteg View Post
Sounds like a vacuum leak or bad fuel pressure/fuel pump. Are there any engine light codes? Keep us updated. Lets get it resolved! I got access to service manuals. What kind of car is it? And try getting some live data if you can, or a Freeze Frame and post it up. When did you notice it happening? Have you done any modifications before this symptom?
agree with fuel pump. this happened to me in a DA and it was the pump priming enough to start the car but not able to keep up pressure to keep it running