Percolation? Heat soak? Don't drive during summer??

Well I think all the stop and go made it run a little warmer (208ish). All I did was change the coolant today...

The stalling seems to be caused by a loose wire from the ecm to the coil; I replaced the wire connectors on the wires that hook up to the coil, replaced the ECU and replaced the ballast resistor.
I hope I am wrong but I doubt just changing the coolant cured you of over heating. Keep drilling Doc
Nice job troubleshooting the wiring issue they can be tough.