2012 maxxforce 13 boost surging

614193

{"text":"This engine is dpf/egr free now, I have a scan gauge to readout alternative gauges. The truck is surging really bad under any circumstance, loaded/ unloaded. The boost psi is jumping from high 30s, to high 20s. It did this before a half day, but then never again until now and is constant. Is there a common problem I could go straight to and check or just a turbo failure coming? And the surging doesn't seem to start until 9/10 gears, and then it seems like it's the entire rpm range. Any experience with a similar problem or a where to start would be very helpful. I'm new to the diesel world.","pics":"[]","canComment":true}