CHECK TO SEE IF THE TRUCK HAS A IGNITION CONTROL MODUEL OUR DOES EACH SPARK PLUG HAVE A COIL PACK BUT IF YOU HAVE A DISTIRUBTOR HERE IS A ROTOR AND COIL PICK UP INSIDE THE CAP AND ALSO TRY SCANNING THE CAR TO A SHOP THEY HAVE BETTER SCANNERS AND CAN PIN POINT PROBLEMS WITH MORE ACCURACY. IF THE MOTOR IS A 318 CHANGE THE CRANK SENSOR IF YOUR LOOKING AT THR MOTOR IT ON L/S LOOK BACK AT THE BELLHOUSING FOR TRANS YOU WILL SEE A SENSOR THAAT IS THE CRANKS SENSOR THAT CAN CAUSE THAT TOO HOPE THIS HELPS
SOURCE: cylinder 3 misfire
Make sure you're using the recommended spark plugs. When my car did that, I had put Bosch Platinum Plus-4 plugs in and got that same problem. Turns out the plugs are too hot and cause it to fire prematurely and kick the misfire code.
SOURCE: engine misfires
You didnt mention having changed the spark plug wires, so that is another item that could be culprit as well. As well, it could be a coil pack that is not working properly.
I cannot recall at the moment if that model year uses coil on plugs or if it uses coil packs. Either way, if it uses a coil on plug set up, take the one for the #3 cylinder and move it to say #4 or anyone of your choice and see if the misfire follows
If it uses coil packs, there is likely one coil pack that controls two cylinders. In that case just swap the coil pack with an adjacent one and see if the problem follows. Pay attention to where the spark plug wires go because it will be an issue if you get them mixed up. You just swap the coil packs around.
I would, however, start with the spark plug wires if you have not changed them already.
SOURCE: Misfire with error codes P0300,P0302,P01303, P0102, P0748
Have you tried new Spark Plugs? Also after removing the plugs.
Take a paper towel and roll it up so it is like a long thick pencil. Stick that down the hole the spark plus came out of. Just to clean the moisture out. Also blow some compressed air down the hole.
Make sure all the moisture is out. The put the plugs in.
When you wash you car. Be careful if you wash the engine.
Dont let water get in to the plug holes..
SOURCE: MISFIRE CYLINDER #3 CHECK ENGINE LIGHT COMES ON VEHICLE
Check spark plug wires for corrosion
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