08 Sprinter 3500 with 175,000 on the engine and about 35,000 miles on the engine. Had the A/C compressor replaced a couple of days ago due to a failed clutch bearing. Replaced the cat temp sensor yesterday. Started up like normal today and pulled out into traffic. Rolled into the throttle. She started to accelerate and then it fell on its face. It would barely move. Got it back into the driveway finally. No check engine light at this point. Shut it off and restarted it and the light came on. Used my phone and Torque to pull P0402 and P0544 codes. I believe the P0544 was there yesterday, so I cleared both codes, but no joy. I went home and grabbed my SnapOn Solus Pro and it came up with the P2355 code and that is all that remains at this point. I can't see any broken hoses and when the engine is shut off I can hear the EGR valve moving for its "cleaning" cycle. The engine idles great, there is just no power. Any ideas?