Today I put my cats and stock exhaust on my APS TT car. Took the three inch off so I can roll more on the DL . Anyway. Ive had a misfire cell on my car for days. I clear it and it just comes back on after a while. Well after putting the stock exhaust with cats on I have no code! It cleared itself and hasnt come back on. Just thought it was kind of odd. Anyone else have this happen?

 

I get code 0175,0172 which is running rich in bank 1 and 2 every now and then.

 

Curious what are your A/F's?

 

My A/F @ WOT is 11.5