35:1 stft and p1264 code problem
 

Was on my way to work and got a check engine light while driving then the fuel was cut off by the computer and it threw a p1264 code. Started the car up and my throttle felt off as if the car was lacking power. Another thing when i was going back home i was idling at a stop light and the car read a positive 35:1 stft on oft. The car had a slightly rough idle and was like burping or misfiring or something and it went away when i drove off. Been on a 93 plus tune for months and had it retuned but the problem is still there. I have no clue about this, can anyone help me figure this out.

positive maxed out stft can mean:
leak near lambda
leak in intake between the maf and the cylinders
damaged lambda
damaged maf

Thanks found out it was an air leak. The previous owner didnt use hose clamps for some intake hoses which caused to leak over time.