Re: Trans Over Temp msg displayed
Typically when I see evap leaks on the WK platform its not actually a leak, its the esim switch on the charcoal canister. It is this switch that tells the pcm if there is a leak or not. Typically its just a false failure by a failing esim switch. I dont think I have EVER replaced an purge solenoid on a WK (not that they dont ever fail). I rarely use smoke when testing newer systems, most I go straight to the pressure test, seems like 9 times out of 10 there is no leak indicating a bad esim switch or something like the cap was loose.
EGR valves on the 4.7 are not as common as the hemi but they do fail.
Also a VERY common cause for idle fluctuation on the 4.7l is the throttle position sensor.
Trans temp, due to your symptoms (when it was coming on) It sounds like an erronious message. likely a circuit failure or sensor failure... the temperature sensor is in the transmission range sensor, the valve body must be removed to replace it.... I have seen this failure before.