Hello. I had that exact same problem with an '05 Tioga on a Ford E450 chassis that we once owned. Took it to a local mechanic shop for repair, but the issue did not get resolved. I sold that RV to upgrade before actually fixing that issue, but if I had kept it, I probably would have bit the bullet and taken it to a Ford dealership to have them fix a problem. I, too, believe that is a vacuum issue, and the vacuum systems on those engines are very complicated. Good luck, and I hope you get that resolved. Happy Trails...
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