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1995 Buick Park Avenue Question: What is causing my engine to ride rough while attempting to maintaining speed?

 

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Shea Mac, 3.8L V6, Clinton, MD, August 01, 2014, 11:46
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I recently replaced my upper manifold & gaskets, plugs & wires, pcv valve, thermostat, fuel injection o-rings, throttle position sensor, coolant temp sensor, fuel pressure regulator, and changed my oil/filter. I also have 112K on the engine.

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