This code means MAP and EBP don't match at idle. Check MAP sensor connection and hose to intake manifold. The nipple in the intake can clog.
Check EBP connection and tube to exh manifold. These tubes clog with carbon easily, and can be cleaned out....sometimes. If you remove the EBP sensor from the tube, start the truck and you should feel exh from the tube.
These sensors should read 0 and atmospheric when truck is off. If you have a scanner, you can check sensor health with the truck off by comparing their values.