^ this last resort, try running ATF through a tank. Some have had good success, other mild, others none
Any certain amount of atf?
was referring to the $$ aspect of the quick steps, not as the last step per say, but you right :thumbI would not call gm injector cleaner the last resort. I'd say it should be one of the first steps.
Do you run any additives when you fill up?
You are ALWAYS going to have some positive and some negative injectors. It's not that big of a deal until you get way out of spec. Seriously internal damage(like a hole in a piston) would be a +12 or +17.
FWIW I've installed brand new injectors and had balance rates in the 1.xx