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Hello, what was your original question?
A flashing check engine light is a type A misfire. This means fuel isn't being burned and it is going into the exhaust system. This can be damaging in a very short amount of time to the convertor assemblies. Do you know what cylinder is misfiring or a way to test for codes?
So it is cylinder 4 causing the issue. This is the first cylinder on the driver side of the vehicle.It isn't going to be fuel related. If you are getting good spark I would perform a manual compression test and see if you have a burnt valve or something.
The crank sensor controls the spark but it won't cause a single cylinder to misfire. The P0316 means the misfire is being see at start up. You only notice the misfire after the engine is hot?
I can't say for sure without being able to look at the vehicle myself. With the concern you are having you have extra fuel being dumped into the cylinder. This needs to be investigate further to determine why. Is there a wiring issue or is it a base engine concern. I would start with a mechanical compression test as my next step.
If the vehicle overheats also I would def perform a compression test and see what you are getting on cylinder 4 5 6. The misfire can be part of the reason the vehicle is overheating.