Hello, I'm Cam. Please include all the details about your issue so I can accurately advise you. I cannot see your vehicle so please be detailed.
There are 2 possible and very likely causes for this. First is the fuel pump. If the filter was plugged, it could have caused premature wear on the pump and the lower fuel pressure as a result. The second possible and even more likely cause is a plugged converter. These engines are notorious for the catalytic converter plugging up. It will set the Mass Air Flow sensor code because the engine is not breathing correctly. I would start with a back pressure test. This is done be taking the front oxygen sensor out and installing a gauge in there to see what back pressure there is from the cat. There should not be more than 1psi at the most.
I noticed that I have a hard time starting when its raining or cold. The car will start up when the sun is out easily. Is the fuel pressure causing this problem also. I do have a manual for the car and did notice the fuel pressure test procedure
Can you test the pressure and see hthen
I gotta go buy a test kit
oK, you may be able to rent one
when I had the fuel filter changed I did notice the guck that came out was brownish liguid
Then we may be looking to the fuel system for sure, test the pressure and see what that does.