Since you went splashing through water before this stuttering problem, I'm going to say you've got a water problem. Granted, it's been a few days now and things should have dried out, but there's a number of connections that point upwards and are capable of holding water. This is something many of us who have steam cleaned our engines are well aware of. Clean the engine and spend days spluttering and stalling.

Fwiw, there is a subtle but distinctive difference in the way the engine will die from ignition failure vs fuel line pressure loss. Ignition failure will be very "square edged". As in runs, doesn't run. There's no in between or fade out. When fuel pressure drops below critical from something like fuel pump failure the edge isn't as sharp. The engine fades out and dies. It's more "round edged". You can simulate this by pulling the fuse or the connector and see what I mean.