[Gaz64]

With an Edelbrock, you have two bowls that feed a primary and secondary each side, unlike a Holley that has a primary and secondary bowl.
So you can lose one half of the engine, if you are running a dual plane intake.
Possibly one bowl is flooding.
I had this happen to friends car one night. After deciding it had a creeping needle and seat, I drove it home for him, just struggled to run at low speed, where the engine was clearly rich from flooding.
Gary