What is the repair for these two codes? P0088 and P0089. 2003 Chevrolet 2500HD, stock, 265,000 miles.

Just got 4 injectors replaced. put on thr air dog pump separotor the 150 gph one and doesnt smoke at adle anymore:) but i threw this code a day later. a very well trusted GMC mechanic did the work so im almost positive its not that he told me not to worry but seeing the light on is like seein my...