01 E 350 V10 on a coachmen Catalina .Operates fine until a hard stop .Then it shuts down. It will start back up after put it park, key shut off and re started. Thinking it's.the emergency fuel switch but curious if anyone else has had this issue. Thank you in advance.

 

If possible, try shifting it into neutral before trying a hard stop.
If it does not shut down, could be torque converter not releasing fast enough.
If you don't need to physically reset the inertia switch(Fuel shut down) and the inertia switch does not reset by turning the key off and back on , I would think that part would be eliminated. This might be one of those things where we eliminate items one at a time.

 

Welcome to the site..

How many miles on your 350?

Has the concern gotten slowly worse?