well without knowing the history on it, I would start with a tune up. Plugs, plug wires, air filter, pcv valve, fuel filter, the works. There could be other problems, a fueling issue comes to mind. But Id start with a solid tune up and then go from there if it has not already been done.

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Scotty Hall
Bartlesville, OK
2001 Pontiac Grand Prix GTP
It whines a lot, but I like it.

The only limitation you will ever face in life is yourself!