parked governor bouncing to 2100 rpm

[slowpoke]

sorry its a lonestar cm871 dem&nd tuned by unni. about 110000km on dropped in long block. one injector and then jake rockers rebuilt and shafts replaced about 1 month ago. motor built mexico feb 2016. don't know if block came with new cam and crank sensors or if they installed my old ones figure i may try them next. also haven't popped rocker cover yet to check on rocker shaft work may be able to look Sunday. one other thing is it feels like its trying to regen when my truck used to regen air compressor would kick on and off for about 45 minutes, every mechanic told me i was crazy there not connected to each other but it did it.. air would drop, build back up and dryer would blow off at 115 then keep building to 125 then drop again. soon as regen was done air dryer blows off at 125 and holds, weird but that's what it did, now since the drop in mileage its doing same thing for about an hour(except with out the blue smoke) then stops