basically stumped on this one ive got a built boosted ef and the car was hesitating and not giving off spark. so i ordered a brand new dizzy and put it in and now when i start the car it idles perfect and has good throttle response to it, but if i dont keep giving it gas and let the car idle, the car will die out( like its not getting any gas at all). well i put the old dizzy back in and its still doing the same thing with dieing after running at idle. so after replacing the MAIN RELAY, PUTTING ANOTHER SET OF 550 RC LOW P. INJECTORS, CHANGING OUT THE FUEL REGULATOR AND FUEL FILTER. and i have a brand new walboro 255 pump. the car has a conservative tune on 6 lbs and never gave me a problem until now. please if any body has some kind of help they could give me i would appreciate it alot! ive tried alot of things that i didnt post here on the thread and have been in the game for years im just stuck here and need some help. thanks

 

oh and i have no cel light at all. and when i unplug my 2.5map sensor and car will stay running but rough idle. i replaced the map with a brand new gm map and still the same problem.

 

Sounds like a fuel problem..... with some cars there is something that cuts gas to the intake when the engine is not running.

It also guts gas if it loses 12v to the device.

What would do that on your car?

Have you loosened the fuel line fitting under the hood,
bled out the air and checked to see how far the gas spits out?-Bob