code 44 I need help

My 88 blazer started showing a check engine light, but it only does it after driving for a while. i checked the code and it was code 44 (o2 sensor indicates lean)
I have a small broken hose that i am pretty sure is a vacuum hose, so that would make sense. Where can i get a replacment vacuum hose??
I am pretty sure it is a vacuum hose, It is a small gray hose with black ends on it and one end plugs into the fron of the TB.

The motor is a 4.3 liter.

I could find replacment vacuum hoses on autozone or checkers site
can anyone help??

Thanks

Start with the vacuum hoses not just the broken one, but chec them all to make sure they are hooked up and are in good shape. As for the vacuum hose, go in to any auto parts store, they have vacuum hose. If it is the plastic vacuum line you need, you might try a dealer.