hey guys i have a 91 civic and my car will crank and as soon as i let go of the key the car dies. but if i hold the key the car will keep running the car has gas in it and the fuld pump is good because i got it to start earlyer today and it ran once it got started it has a new distributer and sparkplugs and i need to get this car running asap "daily driver" if you guys can help me or give me an idea of what it could be that would be great thanks again guys

 

This actually happened to me a while ago
The vacuum line for the map sensor was unplugged.

 

Bad Ignition Switch -been there done that-