Can a loose Ignition coil cable cause power loss

[brainhax]

Ditto; replace the coil, spark plug wires, spark plugs, air filter, --- and other preventive maintenance (PCV valve/hoses, etc) while while you're in there. FWIW IME Iridium type plugs (Denso Iridium TT for example) work well in the 1FZFE.

"I can see water around the chassis near the muffler when it’s idling or revving"

Did the muffler explosion damage the rear heater lines (is there coolant or just plain water in the cooling system??) or is that water from a recent water crossing?

Coolant and plain water in the radiator.
I don't see any damage in the engine bay related to heater lines. Coolant level is same as it was before the drive today. Water like substance is coming to the exhaust as seen in the last pictures above. Need to figure out if it's the coolant

The water crossing I did was a year ago.