I saw your post in another forum/group board I am also memebr of and did not get a chance to provide comment. So, I will do it here
Do you have a strong smell of diesel fuel? If so, I agree with Mike, you may have a cracked fuel line and it is sucking air when going down the road.
I would also check the connections that comes from the remote START/STOP switch that is inside your coach. There is a Molex type plug on the side of your generator. The wiring going to that connector a well as the connector itself willl deteriorate. If you have an intermittent short to ground for your STOP position, the generator will shut down. Remember to check both sides of the connector.
You may want to give PowerTech a call. They are great to work with.
Power Technology Southeast, Inc.
634 State Road 44
Leesburg, Florida 34748
Phone: (352) 365-2777
Fax: (352) 787-5545