One could also use a system like the following to flush out the entire system and then fill with concentrated ( non-diluted ie; 50/50 ) anti-freeze   https://www.amazon.com/dp/B0002SRH5G/?coliid=IBXVQ52CJGVOB&colid=1VY88PYQ3KPE1&psc=1&ref_=list_c_wl_lv_ov_lig_dp_it  

Ya but up here it’s a Ford Titanium Eh! lol  

"Must have been RockAuto." - That doesn't sound like a confident response to me.   Reliable code reading is the best starting point.   .

The only way to get only the new coolant in the system is to do a few drain-fills with distilled water and then the final fill with a higher concentration of the new coolant expecting some distilled water to remain in the engine.    

Just remember you are not completely draining the coolant from the engine with a normal flush.  Old coolant will still reside in the engine so this may be the cause of your " green "coolant.

Just remember I said that something wrong with the PCM is a possibility, not the actual cause.  Agent 1004 seems confused.   As previously mentioned / questioned, are the spark plugs / coils of known origin?  You mentioned Rock Auto.   Have you checked all spark plug / coil connections to be certain they are secure?   Where do you buy your fuel? I have had past issues with fuel sources that have created intermittent issues like you are mentioning.  Even trusted fuel stations in the past were no longer trusted.  Stations are susceptible to leaky tanks as well as buying cheap fuel from other sources, ie; not Mobil fuel from a certified Mobil distributor so they can increase profit on fuel sales.  

Sounds like something loose in the suspension.  Could have a loose / failed rear shock, which would make it simple to fix.   Have you looked around the area to see if you can see anything out of place; ie: loose inner fender well, shock not properly bolted in place, etc. You can only see so much with the wheel / tire installed.

I run 93 octane because it's available to me and worth it, to me, because I can tell the difference is how the car runs.   No one is saying you have to run 93 octane. What we are saying is the car is not designed to run on greater than 10% ethanol, hence the issue you are having.   Winter gas does not contain more ethanol than summer gas.  Ethanol additive to fuel is regulated to specific amounts by law.   https://auto.howstuffworks.com/fuel-efficiency/fuel-consumption/summer-fuel1.htm  

Higher octane than recommended and under the ethanol percentage cut off, and same ethanol percentage as winter gas, and that is bad? I guess I think of this vehicle as just an appliance. Save $1200 a year in gas, 20%, is huge for me.   I might have jumped to conclusions that it is related to the gas, or maybe it is fine when it isn't 110 degrees, or lower altitude than where I filled up. I still am trying to get the stored/historical code, but nothing is showing it.   If you think that running 93 octane is the only way, good on you. It is an $.80 premium over 87 where I live, $12 a tank. Fill it twice a week, that is a steak dinner for a family.   If it was my weekend toy, like my previous car, sure, it would get premium. 4,000 miles a year the difference is less than $200.

Welcome.   I'm not surprised to hear that you have Fords in Canada - afterall they build them there