It sounds like you may have a damaged wire from your cigarette lighter making contact with some part of your shift linkage? You may be able to pull your ash tray out and see what's going on.
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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.