will not start sometimes after driving logs cam sensor code

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engine turns over and over but does not fire. wait a minute or keep letting engine turn over and it starts. it logs the cam sensor code after starting. A couple of times it has starting bucking and engine tried to quit while driving but let up on the pedal and and it drives normal with check engine light on. I have replaced both cam and crank sensors and the PCm but still does it sometimes. could it be a fuel pressure problem? I want to fix it not pay someone else. this issue is all over the internet on these cars.