I had a stumble when I had a Edelbrock 625 cfm with vacuum secondaries. I installed a Holly demon 625 cfm that has an adjustment to keep the vacuum secondaries from stumbling when accelerating after coasting and it ram great out of the box. I only had to adjust the air mixture screws some. I think the Edelbrock AVS does the same and is easier the access the air mixture screws as they are angled up more than the Holly demon ones.
PANTERA INTERNATIONAL
A DE TOMASO CAR CLUB
Presents the De Tomaso Forums
The On-Line Meeting Place for De Tomaso Owners and Enthusiasts From Around the World
Clicking on the banner will take you to the sponsor's website.