2.3 Rattle in one Cylinder
 

Hey guys,
need some ideas.

2007 2.3 hatchback, engine looks like it might not be original...but it's stamped L3N5

Rattle with throttle, seems to be in time with engine and mostly consistent. I can't hear it without throttle.

No performance issue, wouldn't know there was a problem without the noise.
Oil is 5w20 blend and in good shape
Spark Plug looks healthy
Injector looks healthy
No engine codes

I listend with a screwdriver and then pulled the plug wire from Cylinder 1 and the rattle is gone completely

Ideas?
Thanks!