I have a similar problem. Your push rod may not be adjusted properly. I'd like an explanation as to how to know where to set it. It should be maybe 1/16" or so between it and the bore surface?
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.