Bad distributor cap, plug wire, or spark plug.
( .044 inch ) spark plug gap for your 1984 ( 300 cubic inch ) 4.9 L straight 6 cylinder Ford engine
The spark plug firing order for the 300 cubic inch straight 6 cylinder Ford is : 1 - 5 - 3 - 6 - 2 - 4 The distributor rotor turns CLOCKWISE
The spark plug gap for the 4.9 liter ( 300 cubic inch ) straight 6 cylinder engine in a 1996 Ford F-150 is ( .044 inch ) according to motorcraft.com
In a 1978 Ford truck , 300 cubic inch ( 4.9 L ) straight 6 cylinder , the spark plug gap is : .054 inch ( .044 inch in California ) according to www . motorcraft . com ( no spaces )
.035 inch - light duty .030 inch - medium duty for the 1970 Ford - 300 cubic inch - straight 6 cylinder according to motorcraft.com
( .044 inch ) - for the 4.9 L ( 300 cubic inch ) straight 6 cylinder engine in a 1989 Ford truck
.044 inch ( for the 4.9 L / 300 cubic inch straight 6 cylinder in a 1983 Ford truck ) according to motorcraft.com - one of Fords websites
For a 1984 Ford F-150 , 4.9 liter / 300 cubic inch inline six cylinder : Running on gasoline ( .044 inch spark plug gap ) * I only have running on gasoline because the Ford website has two listings ( .034 for LPG )
www.motorcraft.com shows the 1994 F150 4.9 L ( 300 cubic inch ) straight six spark plug gap as .044 inch
The 1978 Ford truck 300 cubic inch straight 6 cylinder spark plug gap is .054 inch ( .044 inch in California ) according to www . motorcraft . com ( no spaces )
( .035 inch ) in a Ford F-100 , ( .030 inch ) in heavier duty trucks