Farr,
It honestly sounds like the low end was too rich. At idle the engine loads up with fuel and when you open the throttle it simply floods and dies. You need to lean out the low end. But.... I will tell you right now that a LA engine with the airbleed carb can be a bit cranky to tune the low end. It's very hard to adjust the low end. The trick is very VERY small movements on the airbleed screw. 1/16th or less increments is what you need to do when making adjustments on the low end. It might take a bit to get the setting right, but that's what you need to do.

Ken