What the frick *&^% is that

They keep the C4 for 2 whole months, charge 1180 bucks and the same problem exists,
I'd burn the joint down !
You still have not mentioned what year, model and engine, as my answers change depending on that
Anyone that works on GM vehicles should have an OBD-I scanner and would find out what the problem is at idle in closed loop
in 5 minutes or less.
As I posted above the code 44 says the O2 sensor is reporting that the AFR is very lean, the scanner would show if that is true or not as at idle the AFR should be 14.7:1, any higher than that would be lean, if not having OBD-I scanner than an exhaust analyzer stuck in an exhaust tip would read what the AFR is
Code 33, depending on which year C4 and which engine so that code would mean either a MAP sensor reports low vacuum or
The MAF sensor is not reporting the amount of airflow correctly
Typical causes for these codes include:
1) Faulty MAF-to-ECM connection
2) Exceedingly noisy spark plug wires
3) Poor routing of MAF harness (i.e. near coil packs)
4) Maladjusted TPS sensor
5) Defective MAF sensor
6) Defective ECM
7) Defective MAP sensor, or vacuum leak
As to MAF which mounts between the air cleaner and throttle body, has it been cleaned with MAF cleaner ?
And is the aircleaner clean ?
Using a carb spray cleaner spray around hoses, intake manifold, etc and if there is a leak that spray would get sucked in
and the RPMs would quickly change
#4 above if TPS sensor which is mounted off the throttlebody is out of adjustment, should be checked and adjusted if needed