Ruiner

Basically, the graphs are the results of a datalog that I did on my car; specifically on the short term fuel trims (STFTs - right and left banks) and O2 sensors (right and left banks) while at idle.

As can be seen, most of the time the graph is representative of the car at idle (rpm = 750 or so). The small "blips" that can be seen are when I quickly revved the throttle a few times.

At idle, you can see that my STFTs are heavily negative (-13, -16, -20, etc). That is not good and can be symptoms of a MAF that is having issues.