Car has been throwing lean codes recently, sometimes bank 1 and sometimes bank 2. Then it went to lean on both banks another day . The other day it threw codes 0171,0174,0172,1075, both banks lean and both banks rich. Yesterday it threw 0171,0174,0172, banks 1 and 2 lean and bank 1 rich. The car is 04 auto,37000 miles needswings intake, eurocharged tune. It has a new battery. I have adjusted the intake several times to check for leaks,put on a new maf (bosch) . Checked fuel door for a good seal,checked oil filer canister for a good seal , check oil filler cap for a good seal. I am going to load the stock tune back onto the ecm to see if that makes a difference. Seems like if it was a o2 sensor it would need to be on both sides which seems unlikely to go out at the same time. Any ideas before I load the stock tune back onto the ecm.

Thanks,