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A number of things could be At Fault, the car needs a systematic problem analysis. I would look at the fuel system to begin with, then the cylinder head should be looked at. How are the valves? Timing could also be wrong. In my opinion the most likely problem source in this case is the fuel system.

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Q: You just changed the serpentine belt tension pulley and spark plugs on your 1997 Pontiac Grand Am Now it will start but sputters and dies It also has a loud clanking noise What could be wrong?
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