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Go to back of bus and sitting on top of engine is the linkage spring - this is a two man job
Have someone rev up engine so you can see where the spring is located. It goes to a lever that has a spring on it
Ok then it could be the throttle cable it self that goes from peddle to back of bus or the pedal push rod - but lets check a couple of other items first.
Lower front bumper, remove spare tire - now try it - any different - if no then
Crawl into front where spare tire was located you have some adjustments and grease fittings for the pedal try that - let me know
IF you know for sure that the problem is NOT in the pedal AND the cable moves freely in the housing when disconnected at both ends, then either the sping is too heavy for this application OR the problem is on the fuel linkage at the engine. NO other possibilities here. Use the process of elimination. Hope that provides some help here. Please get back to me if you need more as all follow ups are included in our fee.
Perhaps this would be something to consider and help eliminate this issue..............see the attached link. http://www.coachconversioncentral.com/airthrottle.htm