Injector question

[Brandon Rogers]

Guys-
My engine has about 195,000 miles on it - presumably original injectors.
How can you tell if its time to have them professionally
rebuilt/cleaned/whatever?  My car is running rich and I have replaced
the 02 sensor, coolant temp sensor, no vac leaks, no codes, plugs and
cap/rotor have 15k miles, MAF has been tested on another car.  Somebody
suggested maybe injectors aren't spraying a good pattern and may need
service.  Seems to make sense, potentially.
 
Thanks-
 
Brandon