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When was the last time that the engine functioned correctly?
When was the last time that the cooling system was serviced?
Does the primer bulb ever go soft or collapse?
Could you move any fuel with it when this happens?
Ok. The water pump for your engine is recommended to be replaced every 2 years. you could just have a lack of cooling water to the engine and it is getting too warm inside the cover when it is in its heat soak period.
Injectors would sound an alarm. the coils, either work or dont. this engine will even run on one cylinder.
The water flow on this engine will not get hot at the tale-tell. It splits at the bottom of the exhaust plate, goes through the fuel cooler, then the pulse pump, and out of the engine. Even if you have good flow there. The engine may be just getting enough to not throw the overheat code.
For water flow or the injectors and coils?