hey i have got a R33 and wenever i go to slow down or go up my drive way , go to park it , or put it in reverse sometimes the revs will drop and it will some times stall or go really low and then kick its self back up ... i have cleaned out the idol speed motor and it still does it could it be a vacum leek or piping to the turbo not conectted prop if any 1 has any ideas and can help thanks heaps