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I replaced the wires spark plugs and coils and nothing helped, all of them are new, and there is no corrosion under the coils

It blinks until I go down to 55 mph, and then if I don't shut the car off it goes off at random times after that. But it doesn't start till 65, stops at 55 sometimes, other times it randomly shuts off, and then keep driving and it does it again for a bit.

Yes it says all Normal, can't even get a fault code

My car: 2008 Pontiac Grand Prix Engine: 3800 Series III V6 Milage: 92,600 Problem: Ok weird stuff is happening. When I drive around 62 - 65 mph on the interstate, my check engine light comes on and if I'm on cruise control disables it. It then randomly shuts off with no code. I already replaces...