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P0453 - Evaporative Emissions Control System Pressure Sensor High Input
P1441 - Manufacturer Evap flow code

Looks like you changed a lot of parts. What I can tell you is the P0453 is for the FTP sensor circuit. If you powered up the vehicle with it disconnected, that code could have been set. Since it is in history I wouldn't worry about it too much. I'd clear it and see if it resets as you don't want to chase a problem that is already fixed.

The second code P1441 (and I don't have as much information on it as I'd like) is Chevy specific. Basically it is saying the EVAP system failed the purge flow test. This can be caused by a leak in the system or a defective purge solenoid, carbon canister or FTP sensor. Since all of that looks like it has been changed, I would suspect a leak. (Did you replace the fuel cap with a factory replacement?) Aftermarket caps have weak quality control and sometimes they don't seal properly. New doesn't always mean good.

Your best best is to have the EVAP system leak checked with a certified EVAP smoke machine. If there is a leak, that should find it. And help you fix this issue.

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Thanks for the reply. The smoke test will be next but first I am in the process of replacing the throttle position sensor and I just cleaned out the mass air flow sensor. I also noticed although I replaced the PCV valve itself I neglected to replace theplastic line attached to it which has another plug into the top of engine. I noticed the seal is bad and it is leaking a bit of fluid around it. Once done with thoughs then onto the smoke. I did replace the gas cap twice with what the auto store said was factory fit but it did not come direct from the dealer specifically. I will check on getting one at the dealer.

I did forget to mention the car does have an issue when I put gas in it also. Once the gas is pumped in ( I never top it over full ) and the cap put back on when I go to start it it will start then die. Alot. I can't get out of the station for awhile until I keep starting it several times and rev it. After several minutes of this it will start and drive just fine. Does this help pin point more or is it something seperate do you think. My other car stays running if I take the gas cap off and never dies when gas is put in but not this Malibu it will die instantly if you remove the gas cap when it is running (though I donot make a habit of removing the cap when running I just thought it odd) Thank you for your time.

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That is odd. It shouldn't make a difference if the cap is on or not. Or if fuel is added or not.

Sounds like the cap removal is what is common to both issues, but I'm not sure how removing the pressure seal (cap) from the tank would cause a drivability issue.

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I replace the PCV valve line today and the throttle position sensor and the check engine light went out immediately. I am led to believe it was the PCV valve line not making a good seal at its connection on the top of the engine. I am dumb founded as to why no one includiing myself did not see the small leakage there before other than to say it was hard for me to see as there is a metal flange that rests over the top of it and blocks a clear view. I did the gas cap removal test and it will stay running now. I am relieved.

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