wont start on 2002 Pontiac Grand Am

I just got my 2002 pontiac grand am gt two weeks ago. It drove fine then three days ago i shut it off the next day wont start. I changed the fuel filter and camshaft sensor. The fuel pressure is reading 50 pounds. Im at a loss. Shot of ether it starts right up and will start all day when the engine is still warm but once it cools wont start again. Help?

Asked by for the 2002 Pontiac Grand Am
1 answer
Check for the injector pulse with a voltmeter or testlight. I think the injectors are not working because of maybe a connector problem. Check for water or corrosion in the connector for the injector harness.
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