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I have a 1995 Buick Riviera supercharged in good condition. I just fixed the SC by putting in a new  coupler. My ? Is when I rev it up to 3500rpms steady but the engine rpms goes up and down in the same rythem. Why?

 


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The superchargers are very touchy for my experience with that kind of mods they often actually need rebuilding you can feel around try to fix them but I had no luck trying to do that myself on customers cars if they wanted them right they just got another supercharger and I installed it for them


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The good news is that you didn't get a turbo charger.


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