Without feedback we have no way of knowing what's going on
You can randomly change parts and hope you hit the correct part quickly but if you guess wrong it can get expensive
Here is an example of a 500 which had
Changing to new:
-Battery (Varta Silver)
-Spark plugs (bosch iridium)
-Temp and Press sensor on the intake (new bosch installed)
-Water temp sensor (new delphi installed)
-Crank and cam shaft position sensors (new bosch installed)
-Installed new fuel pump assembly
None of which solved the problem
Post 2 give some of the possibilities
O2 SENSOR HEATER OPERATION
EVAP PURGE SOLENOID OPERATION
O2 SENSOR SIGNAL CIRCUIT
O2 SENSOR RETURN CIRCUIT
O2 SENSOR
MAP SENSOR
ECT SENSOR
ENGINE MECHANICAL
FUEL FILTER/PRESSURE REGULATOR
POWERTRAIN CONTROL MODULE (PCM)
Photo of all the plugs in the cylinder order would be helpful, is one injector leaking, I don't know from here
Pull the MAP and photo the end, is it coved a oil mist
We don't even know what type of engine management system we have yet, 1.2 dynamic could be cable or flyby wire
Take a picture of the throttle body
Any more water rushing sounds