so i failed my emissions today with these codes 0740, 0753, 0758, 0785 first things first i need to know if this is a do it yourself job or do i have to take my car to the shop? how much am i looking to spend at a shop compared to by myself, how much are and what are the parts that i need?

thanks in advance guys.

and i have a 97 chevy blazer too

 

My code list is not on this computer, google up the codes on BF home page and track it from there, most likely only one thing wrong but all on the same circuit. Don't look at code lists as parts to to change but indications of areas to look.

 

http://www.google.com/url?sa=t&rct=j...bPBgO7-vzpHXug gm code list pdf