I have a duramax diesel that is giving me the P0101 code.

What is your question?

Years ago I installed a open air filter box that had a K&N filter on it. I started getting the P0101 code. I was told that the maf doesn't like the oil that is used in the filter. I replaced the K&N filter with a cone shaped dry filter. I also took the maf out and cleaned it with some electrical cleaner but still get the code off and on. I don't really notice a difference in the way it runs. I decided the other day to purchase a new maf sensor and put it in and after I drove it awhile the code came back. My question is can having an open air box cause it to get to much air causing the code or do I need to look for other problems.