2003 Ford F-150 Questions

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I check Freon that's good. I have the A/C heater auto climate control unit.

I am not sure if I am posting in correct place. My husband has a 2003 Ford F-150 with a 4.6 L V8 that has many problems. 1. The Service Engine light comes on. 2. The engine starts missing. 3. The Temperature Gauge goes to hot. 4. Oil light comes on. 5. He put a tester on it and it reads that the #1 Cylinder Misfire Code comes up.
What he has repaired so far: 1. Replaced the PCM. 2. Replaced all plugs & all coils. 3. Checked all fuses.
It is still doing this. What is causing this problem?

had alternator repaired and replaced-factory unit

I got an engine code 302 and pulled the coil and plug and there is oil all over it

I replaced everything from fuse, relay, fan speed switch, resistor, blower motor, still not working, what's next please!!

Above the windshield before the sunglasses compartment is a button that says select and a window. This does not light up. Owners manual says it displays outside temp and compass direction

It already has a new master cylinder and the brakes were just bled

Washer also doesn't work. What else could be wrong?

Need to know the spark plug gap using autolite 5144 copper plugs

Truck won't start. Just clicks. New starter relay switch didn't help. What else could it be?

Everytime I step on my brakes my parking lights go on my dashboard and radio go's low

And inside the truck the radio and mileage light goes off

After installing new plugs/wires I still have a rough running engine. I've checked everything and all installation looks correct.

I'm wondering about disconnecting the battery to see if it helps to reset things.

What are the downsides of doing the disconnect ?

I'm using the sp-504 spark plugs. They come preset at .044.

The service manual says use .054, but refers to an extinct plug agsf-34EE .

Which gap should I use, .044 or .054 ?