Hi im new here. Hello folks! Im an rv/camper guy and getting ready to start thread concerning my oachman catalina (furnace problem).but was just searching for help on my truck and the net sent me here so i joined! So here goes,i have a 93 ford f600 7.0litre (429) with at 542 tranny.had the truck 5 years runs good,75000 miles driven seasonal from may to Oct.short trips. (Asphalt sealing) the only issues are intermittent! Sometimes going from neutral to d it idles up high.transmission shifts great except at about steady 45 it will d ownshiftt u pshift downshift u pshift etc.let off throttle or accelerate its fine.im not sure if vacuum is a factor? Or what would control that function?fluids/filter have not been changed.lucas grilling assisted brakes i think from trans fluid?i know this thread isn't a rv stuff but im a camper man lol.so if anyone helps i gladly appreciate it.and will watchthreads for any camper related problems in case i can help thank you!