1970 w/454 starts then dies once the key is let go
I just got back from Korea and the car got neglected for about a year... for the most part it ha been running just fine. Today i took the carb off cleaned and oiled it up then took it for a spin. I noticed that it was hesitating if i punched it a little (not floored) and would backfire out the carb (only in low RPMs).
So i went home did some research and decided to look for a vacuum leak since that could be the problem and i could hear a distinct whistling sound while it idled. I went to the car 15 mins after driving around and now it wont stay running.
It will turn over just fine and start, but as soon as i let go of the key it dies instantly. If i turn the key and gas it a little the RPMs will shoot up as long as i have the key turned but once i let go of the key it dies not matter what.
I checked the carb gets gas when the throttle is pushed and the battery is 1 day old. the carb is about 2 years old Holly 770 CFM and its been running great other than the hesitation at low RPMs.