Replace them with newer injectors from the JY. They are disposable.
New injectors from the Junk Yard, now thats an oxymoron.Why would they be any better than the ones he is replacing if they are, as you say, "disposable"?
I just sent mine off to http://www.witchhunter.com $19 per injector and $10 shipping ($86 total) I am expecting them back in about as week.Check out the web site looks like they know what they're doing.