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need help bad. thank you on 2004 Cadillac DeVille

car keep cutting off when try to start it

Asked by for the 2004 Cadillac DeVille
You have to check for the basics - spark, fuel and air. Something is missing from the equation - testing is required - fuel pressure, spark, air intake leaks, restriction... Nothing is easy to see via the Internet - you will need to perform some rudimentary testing to determine the cause of your issues. Good luck!