acetylene gauge pulsating

What causes a acetylene regularot to start pulsuting? The manifold is
about 5 years old, with about 10 hours of use. This is my second
regulator doing the same thing. Do i throw it away again and buy a new
one or can it be repaired? The first one caused a flash back that
boomed so bad that the torch went one way and I feel back out of my
chair. Had to change my underwear after that. This last regulator was
a Rador and the salesman said it was made by Victor.

Thanks,
Mac
.

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