Cm 870 egr

[Rawze]

did u clean out the Delta-p tubes and replace the sensor?. it is located to the right of the fuel filter hidden back against the block.

also might want to replace intake pressure and other related sensors if they are old too.

last but not least, the 870 has an air actuated turbo arm. they tend to be a bit laggy and can hang up and cause some issues sometimes. Same thing with the controller.