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Originally Posted by phewop118
It sounds like a fuel delivery problem. Not sure what all you changed, but did you change the fuel pressure regulator? How about the fuel pump? I know on my Intrigue (almost the same as an Impala), the fuel pressure regulator causes that to happen occasionally when the engine's warm, but it will start after I try again and give it a little gas. There is test to run on it to make sure it can maintain pressure.
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I have changed the FPR already... It was one of the 1st things I changed over 1 year ago... Also ran a fuel pressure test and it checked out OK...
I have not changed the fuel pump...