hello, I need help with my 2010 cobalt ss tc, I have a Catless downpipe badmad and custom EXHAUST with Varex and stock programing and it runs poorly. I go to a tuner in two weeks and I have need of my car waiting and I have not the stock downpipe. I wanted to know why the computer reacted as his. I'd like to show you my scan but I did not find how to insert file. the engine seems to run too rich and has missed at times, sometimes to put out as idle. I try to disable my code bank 1 sensor 2 and not change anything. thank you in advance and I apologize for the mistakes, my English is very basic
Charles