Question about 2002 Chevrolet Blazer

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Intermitent starting problem

My 2002 trailblazer starts intermitently.The fuel pump was replaced November 19th 2008. It ran for three weeks and then the same problem occurred. The throttle body assembly was replaced because of a p1523 code which is throttle malfunction. A garage has been looking at it but couldn't find anything wrong with it. I went out today to start it and guess doesn't start. Can you give me some ideas of what could be the problem?

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