I think i may know the issue. It has to do with the security system failing. its very common in gm cars. i had it happend to my chevy. Your car year make and model is on the list for this problem. I found a part that you can install yourself and it will bypass the system allowing your car to start with no problem. Check it out its %100 guaranteed and if u need help or have questions they have great customer service. I installed mine over 5 years ago and i havent had an issue since.. I hope this helps ya Do It Yourself GM Security bypass
Will not stay running , hard to start ! Have the fuel pump pressure an flow tested . Check the fuel pressure regulator for fuel leakage , have the vehicle check for codes .
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