jwoods61us wrote:
It could also be the ECM (or what ever it is called on OBD1 systems). Ghost problems that are wildly unrelated often indicate that the ECM is going out. You might try searching the Dorman website to see if one is available. Clicky
+1 on the ECM. Similar issues on my E350 van. Hard to start, stalling, transmission starting in 3rd gear, etc. You can buy a replacement ECM from any auto parts store or mail order for $100 or so. It's easy plug and play as long as it's accessible on your RV, so it would be a pretty cheap shot at getting you on the road.
Also agree with others I doubt it's an ABS controller. When it or a wheel-speed sensor fails the ABS light on the dash comes on but other than the ABS not functioning it does nothing to affect the drivability.