Dazed and Confused
Join Date: May 2012
Location: Upstate New York
Re: Injector problem--- I think
I'd start by changing out your vacuum lines and bushings. You're getting a lean code that's worse when it's warm, I wouldn't expect a fuel filter or pump to respond like that. Besides, if it's a 99 and you're still running the original vacuum lines, they have to be dry rotted by now.
Ever notice that there's so many high performance parts available for GM products?
Did you ever think that maybe they NEED them?