0.042-0.046 is the correct gap for your spark plugs,If it is backfiring now and was not before make sure you were not sold platinum bosch plugs and if you are using factory plugs,then I be looking for a faulty spark plug.Also make sure the firing order is correct.
Spark Plug Gap 96 ranger 3.0 is-- 0.044 inch, Ignition Timing is--- 10 degrees BTDC, Firing Order is--- 1-4-2-5-3-6
have a good day ! timing may be off a bit.--
Very good other answers. Hopefully you also used oem Motorcraft plugs, because the Ford pickups run better with the oem plugs
Tune Up
Spark Plug
AWSF-42C
Spark Plug Gap
0.044
Ignition Timing
10 degrees BTDC
Firing Order
1-4-2-5-3-6
Distributor Rotation
Clockwise
Valve Clearance Intake
0.014
Valve Clearance Exhaust
0.016
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