2018 Jeep renegade 2.4 L engine new thermostat got put in now it’s having overheating issues

Where can I purchase the rear engine mounting, aka lollypop mounting

When I checked the car with the fault scanner, the code P1CEE appeared, but I did not know where the fault was. and when I start the car the RPM goes up

my engine will shut off on average once a day when its above 90 degrees outside. I am an Uber driver. I ususally starts back up almost immediatley. Sometimes it takes a couple of minutes. Ive been told the fuel pump is overheating but cant confirm that