Fluctuating throttle percentage and erratic afr's

What is your question?

2002 Mazdaspeed protege I've recently had an issue with my afr's being way off. At idle it fluctuates from 10-17afr and averaging in the 15 zone. While cruising I can feel the car going lean and rich while afr's will drop to 10 and go as high as 17. A boost leak test has been done. There are no vacuum leaks. 02 sensor has been replaced. EGR has been tested and cleaned. Fuel injectors have been replaced with new ones as well as gaskets/o-rings. New intake gasket and manifold gasket. The only trouble codes I'm getting are for bank 1 too rich and EGR insufficient.

What makes this problem better or worse?

Nothing

How long has your 2002 Mazda Protege had this problem?

A few months