Joe: Mine is a LATE model year 1998 chassis. I have disk all around and DDC IV, so I guess even though it”s a 1998 I got most of the 1999 model year stuff.
When picking up parts at Prevost Winter Garden I meet their Southeastern district trainer. He suggested airing up the bus and applying the brakes a few times after the job was finished and before the tires were reinstalled to review and confirm proper operation of the breaks.

Once the bus is back on the ground and driven do you think there is a chance the high idle will start working again?

Chuck