Bill,
Since your Cummins engine is computer controlled, the throttle pedal sends an electrical signal to the computer and the computer controls the fuel going to the engine. When this happens, does the throttle position reading on your Aladdin or Silverleaf change when you depress the throttle pedal?
If you are not at least a fair mechanic, troubleshooting this problem will probable be too involved, and it will be best handled at your local Cummins dealer. However, if you want to try it yourself, contact BAC member Dave Atherton and he can give you the values to look for in troubleshooting the issue.
Gerald