Code P0303 cylinder 3 misfire

I would try swapping the coil pack to another location, then clear the code. When the code comes back, see if it indicates the new location of the coil pack. If that's the case, you hit a home run and just have to buy a coil pack. If the problem doesn't move, try swapping the spark plug to see if the problem code indicates the new location. If the problem doesn't move again.....I'm not sure if there will be an easy fix.

 

Be careful NOT TO MOVE ANY WIRES!! Just the coil pack. Remove the jack for the coil on the #3 cylinder. Then unbolt the coil (2 screws). The coil will pull off like a spark plug boot. Move it to a new location. Replace with other coil. It just presses on. Replace the 2 bolts and jack in the connector. You are now done.
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I forgot to add the cylinder position info:

The cylinders are aranged in this order
/\ front
5 1
6 2
7 3
8 4

I got the above info from the Internet, I can't attest to the accuracy, but I have no reason to think it's incorrect.

 

It's correct

 

Sounds good, please let us know the results. I'll keep my fingers crossed for you.

 

Interesting. On the F430 it is;
/\front
8 1
7 2
6 3
5 4

I did not expect Ferrari to change their ordering convention, but not surprised either.

 

If the diagnostic approach described above does not eliminate the problem, another common cause for misfires is failed gaskets on the intake manifold to cylinder head connection point. I experienced that problem.
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Good call, if swapping coils didn't work, I was going to suggest the possibility of the intake manifold gaskets leaking. By the way, out of curiosity, how much does replacing the gaskets cost at a dealership (approx.)?

 

+1; will add that upon close visual inspection of the assembled intake, sometimes you can visually see or audibly hear the gasket leak. Visually it looks like dark residue sometimes oily, sometimes dry, in a pattern as if sprayed out from the base of the intake runner at the foot of the block. I wish I had a pic handy. Inspecting is hard but is done from
the top of the engine.

 

Awesome news, I'm glad it was just the coil pack!

 

Nice!
Thanks for sharing the results.