Injector replacement didn't solve my issue, thoughts?

[Johnboy]

Check the fuel filters I have seen the davcos threaded ring loosen up and cause problems but for good measure change them anyway if you haven't already also have you considered winter blend fuel?
I'm not being a smart @ss every year it throws me for a loop with something poor performance, hard starts, fuel milage, just thoughts here its not always a mechanical problem lots of times it's something simple. I'm not saying you don't have a mechanical issue just throwing that out there.