check for foreign debris in the primaries. Might have a screw fallen in there unnoticed and holding the throttle plates open, then rattles around enough to get out of the way.
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.