Q: I have a 2003 Cadillac CTS. My engine hesitates then shuts off

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I just replaced the cerpentine belt and pully. My enigine wont turn over still. It tries to crank then shuts off on its own. I also replaced the crankshaft position sensor. What could be causing this to happen?

My car has 160000 miles.
My car has an automatic transmission.

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