While I agree with Mikael that late (VERY Late) timing can do this, make sure you perform Joules' verification of plug wires.
Please post up when you have verified it, so we won't keep thinking to ourselves... "the guy's plug wires are mixed up"..
#1 is the Passenger Front cylinder. #5 is the front driver side.
NOTE: This is important because Ford motors have two different firing orders, that can easily be confused.
Rocky
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.