The Ford 4.2 V6 engine typically has a specific plug wire routing to ensure proper firing order and engine performance. The firing order for the 4.2L engine is 1-6-5-4-3-2. The wires should be routed from the distributor cap or ignition coil to the spark plugs in this order, starting from the front of the engine. It's important to keep the wires separated to prevent cross-firing and to avoid contact with hot engine components.
gap is 42
proper gap is 42-46
First, double check your plug wire routing from when you changed the ICM. It could also be a bad crankshaft position sensor.
gap the plugs between 42 and 46
AWSF - 42 C ( copper suppressor spark plug ) .044 inch gap or if you want a platinum plug AWSF - 42 P ( platinum suppressor spark plug ) MOTORCRAFT PART NUMBERS
you will need a 5/8 spark plug wrench let the engine cool, then disconnect the negative battery cable remove the spark plug wire from the first plug and remove and replace the plug dont forget to gap the new plugs between 42 and 46 and repeat on the next one be sure to only do 1 at a time as not to mess up the firing order
026013673
Look under the hood and you will find a placard with this information listed. .42-.46 for 7.5L(460 ci)
American Wire Gauge
Generally, at the right front corner, just follow the 1/4'" diameter black wire to the cap concealing it. If this a newer engine, it is probably an RC-12YC or equivalent. Remove the cap carefully as it will often tend to stick to the plug.
.42-.45
Motorcraft AWSF 42 or 42C . You can cross reference other brands from this and use them also, like Bosch, Champion, Nippendenso etc.