Join Date: May 2010
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Vehicle: 2010 crew cab 4x4 6.4 PSD auto trans
Mileage of tow: 2k
Weight of load: 8k
I too experienced the "shudder" you mentioned, but based on everything I have read/experienced about the notorious EGR problems, I think it's the EGR.
If I let off the throttle and stepped on it again, the power returned, and it seemed to "stay in gear" if you will. I think once I let off of the EGR changed positions and returned the power. I was also pulling on a hot July day from MS to FL back to MS which would be a higher likelihood of something happening.
It sounds weird I know. Try doing an EGR/DPF delete to your vehicle and post the results. Not to mention the fuel mileage should go up once the mod is done. I suggest using an SCT programmer so you can avoid having the check-engine light.
Thanks and hope this helps.