Hector,

To enable the fast idle you need to be in neutral and the parking brake needs to be on. If that does not do it something is open in the circuit.

If you are going to follow the article on the suspension repairs use your coach for a while and see how things work. Just before Branson for the first time since I owned my coach (3 years) it decided to lean. It was a single incident because it hasn't leaned since. I'm still going to go through it this winter just because everything else under it is new except the valves.

The hardest part of solving a coach problem is not knowing the history. If you have the maintenance records you have a starting point. Without the records you need to create a starting point, so that is why I suggest getting to know the coach before you dive right in. You may fix something that ain't broke.