Sounds like it's low on fluid. If it was working good and this is a sudden change, check the fluid. The modulators on them are known to rupture the diaphragm and suck the fluid into the intake and burn it, so there won't be an obvious leak.
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Mitch
1970 Chevelle SS
1966 Chevelle SS
1967 Camaro ss/rs
1938 Business coupe, street rod
2000 FXSTS, original owner, 13k miles
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