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It could be a bad connection at the ignition switch or a bad key tumbler. Or you could also have leaking fuel injectors. Which would make the engine continue to run for a little bit after you turn it off because the cylinders are hot and you have compression. But if you had leaking injectors you would probably be able to smell more gas than normal out of the exhaust while it's running normally. How long does it continue to run after you turn the engine off? If it dies after a little while when you turn it off it will more than likely be the injectors but if it continues to run and you have to take off a battery cable or disconnect something else to turn it off than more than likely it is the ign. switch or key tumbler.
You mean you turn the key of and engine keeps runing? if that's right posible some one conect you radiator fan to a ignition power and that keeps engine runing because the fan keeps turning and acts like generator putting power back to system, but if not let me know and don't mark my answer as inapropiate,
just can figure your question, you know what's bad? with this web page, than i'm here i will say may be waisting my time trying to help people for free and then after that people still mark my answers as inaproiate, is that fair? whell good luck and let me know, good luck
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Could be a blown head gasket. You might also need to "burp" the system. When the vehicle is completely cooled down, try taking the radiator cap off, topping off fluid, and start the engine. That should help get air out. If it starts bubbling and shooting coolant out, something is wrong. You could also try running without the thermostat or just go ahead and replace it. They aren't usually expensive.
My first thought is that you may have a fuel filter issue or a fuel pump starting to go south. The part about the battery could be a dirty terminal, loose cable or the battery is giving up. Clean the cables and check fuel pressure. I would try to see what trouble codes are stored and address them as well.
Check your battery terminal's, check woltage when engine is off on your battery, check voltage when running. Could be alternator, battery ior something wrong with charging system.
The flashing check engine light would mean that the engine is misfiring, If you have a scanner, use it on the diagnostic port of the engine to check for the error code to get which cylinder is misfiring and if there are other errors that needs to be checked.
Check all the connections to the BCM for corrosion, and spray some WD-40 on them and wiggle them. See if that changes anything. Look for loose connections or damage.
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