u/Ntesy607

I just installed a T1r single exhaust and today my car had a very choppy idle, was not running right. I noticed a little burble whenever coming off throttle on the first test drive two days ago. Today it progressively got worse over two driving sessions til I parked the car. Smooth when getting on power at higher revs but the idle is all wacked out. I foolishly let the first section of the exhaust hang down under its own weight as I was bolting it to the cat. So my thought is I either damaged the 02 sensor or created an exhaust leak upstream of the cat. But would that cause the car to run like this? Or it's something totally unrelated and pure coincidence. Spark plugs are good and valves adjusted very recently.