2 possiblities: 1) worn piston rings, or 2)leaking valve seals
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Spark plug order? there is no such thing.
That is .054.
.054
According to one of Fords websites : For a 1969 Mercury Cougar ( all factory available engine sizes ) ( .035 inch spark plug gap )
first pull the spark plug boot off and check for tracks, then check the spark plug condition , it's gonna be 1 of 3 things the spark plug itself , injector , or spark plug boot. it could also be the plug wire.
The spark plug gap is .054"
The spark plug gap is .054"
Spark plug gap is .060
Look for oil in the spark plug wells. If there is oil, you will need to replace the valve cover gasket Look for oil in the spark plug wells. If there is oil, you will need to replace the valve cover gasket
Spark Plug gap .044"
The Spark plug location on the 2001 2.5 liter dohc is under the valve cover.