Injectors?
 

I have a 99 blazer and its has some serious power loss somewere. Ive changed just about everything I know of the could be wronge but still no improvement. The motor that is in it now is not the stock motor its a rebuilt, But I was wondering if mabe it has bad Fuel Injectors? Cuz it runs like it has a cork in it.

How hard is it to change injectors? and is their an easy way to check them?

You say you've changed everything you know of. Please elaborate on that some more. What exactly did you change and when?

As well as what diagnostic testing you may have already done and the results would also be helpful.

Well so far me and a friend have came to 3 different things it could be. I thought it was my tranny but I took it to and shop and got it checked and they say its fine. We also thought mabe my exhaust was cloged but we unbolted it and drove it and still no improvement. So we have been thinking its my injectors. ive changed the fuel filter and it dident help my fuel pump is mabe 5 months old.

Ive ran fuel cleaner, injector cleaner, All system cleaner and nothing has helped.

And the diagnostics I have ran have all came up clear saying their is nothing wronge.