when i was driving my 80 series cruiser it stalled. when restarted it started to make a noise as if a hose had gone and then it sounded like a flat tyre briefly and then it went back to a sounding like a hose had gone again. on inspection i could not find any hoses leaking. i checked all water and oil levels and all ok. this noise goes away when in idle but comes back when the vehicle in motion.