The four T44s that I used to have never had a problem with inspections.
Try to replace you air filter.
Your mechanic probably is familiar with the ISV Idle stabilization valve and the throttle body switch that activates its controller. You might want to have its function checked.
If yours has an O2 sensor, that might need replacing.
There is also an adjustment for injector frequency (I don't remember what it is called) that can adjust rich / lean conditions. Your mechanic could look at adjusting that with a dwell meter.
The first thing I would do is to try the suggestion of the inspectors with the "Guaranteed To Pass" and the Techron. It might just be dirty injectors.
Let us know how it tests.