When diagnosing OBD-1 TBI engine always start with the smallest ECM code first in your case 32. Your min idle should be 800rpm (in Park/Neutral) with everything running correctly. The 625 +- is in Drive selection. That is also factory set by GM and t...
A recommendation of starting at 70-80psi for the front bags is too high. Your coach is 28ft and very likely has a front GAWR of 4880lb (same as mine 1994 P-30 28ft). The GM manual air bag pressures for a 5000 GAWR are 40psi min and 50psi max. Your mi...
