Originally Posted by Paul1958
Do you have a scan tool that can read live data? Can you look at the O2 voltage output and the ST/LT FTs? Much better that the parts cannon.
Yes, I've been monitoring the car with Torque even before this happened as got the P0171 light and the long term fuel trim was more in the 8-10 range, but broke out Forscann as Torque won't measure the fuel pressure so used FS for that. When operating normally the front O2 has its normal swings up and down, on Thursday when things went crazy the O2 pegged at 1V and the fuel trim went to +66.
Again when things went crazy it wouldn't even maintain a fixed engine speed when in neutral as when applying enough throttle to keep it around 3000RPM it would bounce between 1000 and 3000. Yesterday when I was finally able to get to it showed no signs of issue and was running like it had the past 116K miles I've driven the car. Something is off somewhere, it is just a matter of time before it reoccurs, and I want to get it figured out sooner than later.