1987 Firebird 5.0 carb engine dying at throttle

Tom said it. Sounds like vacuum leak. Carbs do need adjustments for a quadrajet you can adjust idle air mixture which will help and adjust the idle screw to a proper idle.

I didn't do anything myself. Everything was made by a carb master in service, so I didn't check after him. Will do that tomorrow. Thanks for advices! Will keep updated. Cheers!

Hey people! So finally there is some light at the end of the tunnel.. Went with the car to germany from my place. The car died just before the final point but I made it. Then some 8 people started to look at the carb and problems. So the problem was - there was to many fuel in carb and when I accelerated carb couldn't handle the fuel capacity. And the faul is in the mixture solenoid - rich mixture, low mixture and air/fuel mixture screws are a complete mess and are not adjusted as tey should be. Need to do that and it should run again as it should! Hope this helps somebody! Cheers!

Time to get your money back from that Carb "Master."