Weird idle or when engine hot running. Misfiring.

Ford Mustang S197 V8 GT 2005

Just a quick question. Im getting an error code (see attached). Just wondering if you could offer any advice on what this might relate to.

Symptoms on engine include:

Runs fine when cold. When it gets hot. Frequently when coming to a stop or idle in traffic the engine starts running like a dog, feels like a cylinder gives up, misfiring like. Becomes ok when offer a little rev. But then mostly when revs return to idle symptom returns. However, it's ok when car is in motion...

Hope you can offer a little insight on this. Perhaps you've seen this before.

When looking on net. I see things like a bad diode in the alternator perhaps and the crank shaft sensor noticing first? But that's a very uneducated insight lol. Also the alternator is working ok. Ages ago though, and only once I got a dash light saying Check charging.
 

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