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Your starter is going bad and needs to be replaced also you might want to change your spark plugs and wires use only planium plugs, and maybe change your oil if the engine has engine sludge in it, it makes the starter work harder to turn the crankcase for the engine to turn over. Your car uses 5w-30 try castrol GTX it has a unqiue anti sluge formula 4.7 quarts.

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Q: Why does a Pontiac Grand Prix SE engine crank slow but will not start?
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