after replacing all four o2 sensors idle is rough, what now?

Question

!996 Chevy Tahoe LT 5.7L V8
started with P0430 code
changed all 4 O2 sensors at Meineke shop
left as shop was closing and had terrible with idle and running on way home.
How would this maintenance affect engine performance?
Is ECM having trouble adjusting to the new readings with new sensors?  Will it take a while to adjust?  I disconnected the battery to reboot the computer.  I will try again tomorrow.  What should I check?

Answer 1

P0430 Catalytic below threshold Bank 2

What the front 02 sensor does is maintain fuel control, what the rear 02 sensor does is monitor the catalytic convertor, What ever caused a P0430 would have to be looked into, You can check for plugged catalytic convertor by using a backpressure test. Or look for what is causing the rough  idle. Check for any other code that may have set after the 02 sensor replacement