You need to measure the clearance you have between the clutch disc and the flywheel/pressure plate.
On the three finger you NEED to have about .045" as I recall. The diaphram will put up with .035".
If you don't have that, it is likely the problem.
Having said that though, if you aren't operating the clutch pedal fully, then you have the same issue.
Don't put a carpet mat under the pedals.
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.