might have Ring damage.
.050
It unscrews just like a spark plug.
On a 1995 Ford Contour : According to one of Ford's websites : The spark plugs on the 2.0 liter four cylinder are gapped at ( .050 inch ) For the 2.5 liter V6 ( .054 inch spark plug gap )
According to one of Fords websites : For a 1995 Ford Contour , 2.5 litre V6 engine : ( the spark plugsare gapped at.054 inch )
I WOULD SUSPECT THAT ONE OF THE PLUG WIRES IS NOT MAKING CONTACT OR IS NOW BROKEN.
on the front of the engine. it has a white wire on it and it screws in and out like a spark plug
near the #4 spark plug. 2.0L Engine
It could be either a bad fuel filter or fuel pump or it could be bad spark plugs or cap and rotor or spark plug wires
According to the owners manual found at http://www.scribd.com/doc/2463636/Ford-Contour-Owners-Guide-1999-Model-Year, it is 1.3mm.
Check the Vehicle Emissions Control Information ( VECI ) decal located in the front of the engine compartment ( it will show the type of spark plugs to use and the spark plug gap )
could be valve cover casket leaking
On a 1999 Ford Contour , 2.5 litre V6 engine : firewall 1-----2-----3 4-----5-----6 front of vehicle > driver