Please Help! Low on cash and car is failing Idle Speed Emissions CO & HC. on 1990 Cadillac DeVille

I took the car to a shop and they immediately wanted to replace the Fuel Injectors for $965.00. They informed me that this just might be the start to passing. I am going to try to read the codes this weekend.
I would like to know it changing the injectors first for $960 dollars is really just be the start of a money pit I can’t afford. I love the car and it only has 51,000 miles on it. I am just now trying to get back to work after a yearlong illness. I need to decide if I should buy another viecle or keep working on my baby.

Thanks Dale

Emission Area of fail:

Idle Speed CO 4.64% needs 1.20% to pass.

Idle Speed HC 508 needs 220 parts per million to pass.

Asked by for the 1990 Cadillac DeVille