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Could be a bad coil but usually blinking is emission related, catalytic converter? Recommend you take that to a certified Chevy mechanic for a diagnostic, it's not that expensive.
For starters unplug the battery so it won't go dead. It sounds like an electrical problem possible relay or module gone back. Be careful with this electrical stuff, get a pro to check it out.
there is a problem with the fuses getting wet under the hood, it has been causing alot of problems with headlights you may want to check there for anything
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