Need help with my 2006 Pontiac g5 pursuit!!

sc123

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I just scanned my car again after changing the filters and the same 3 codes came up. (P0301, p117, p0446)... I test drive it after changing them and I noticed a lot more power, and only wanting hesitate about once . When I scanned it, I noticed two symbols blinking red: O2S, and CAT. Is that o2 sensor and catalytic converter? To me it wouldn’t be the o2 sensor because I have ran on the same tank for 2 weeks. No change in fuel mileage. I did get new fuel injectors and a fuel pump but I’m scared if I do all this work it’s not going to fix the problem. Could the p0446 code be cause by a bad vent solenoid?
 
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sc123

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So I replaced all 4 fuel injectors. Check engine light went out right away. I scanned to make sure they the codes gone, I still have the p0446 (evap). I’ve changed my gas cap... what do you think this could be? I’ve check all the hoses no sign of leaks and I can’t hear a sound of a leak either.
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melsg5

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The code points to the vent valve
 

sc123

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So the p1174 code came back. I suspect that it is not fuel injectors because I just changed them this summer. I also suspect that it’s not air filters because I also just did those this summer. If it was an O2 sensor would it not throw O2 sensor codes?
 

melsg5

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Read through this link.
Did you ever do a fuel pressure test including watching for a quick pressure drop after turning off the engine?
 
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