Need some insight on engine stalling issue.

So I'm literally an hour from heading out with the family in our class C motorhome for the Labor Day weekend. I've been driving the motorhome all day getting things ready without issue, anyhow in the last hour I went to turn it on and it kept dying right after it would start. I tried to start it several times and it would just die until I gave it a little gas and then it stayed running. Just now as I was backing it in, it died again, but started right up without issue. When I parked it, it cranked just fine again. We took it out last month and had no issues, since it's been back it's had an oil change and the airfiter changed and has just sat in the driveway. It did get a full tank of gas this morning as well. Any ideas, should I be worried to take it out this weekend? By the way it's a 1997 Tioga on a Ford E350 super duty chassis with 27k miles on it. Thanks!