Unexplainable

i have a 95 pontiac bonneville se with a 96 oldmobile delta 88 se engine.3.8 liter v6. it has 153,000 miles on it and just reacently it been making a really wierd fan swirling noise and doesn't have the quick bounce like it normally has it feels like a tug boat going down the road. Can anyone help me figure this out please.

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Check the engine for a vacuum leak but you also probably have a blocked cat converter that is causing this issues especially since the engine is losing power.