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On mine it was the Intake Manifold gasket .Not just the top plentum but the one under that .Cost about 8.00 for the gaskets.Run the engine codes and if it says misfire on a plug then that could be it .

Could also be a clogged fuel filter, a bad Idle Air Control sensor (which can be cleaner with carb cleaner), or a faulty EGR valve which I was recently told by an old timer at NAPA that they rarely fail....And for me just recently it was the most obvious, faulty plug wires...but for $10 for some plugs and $20 and change for the ignition wires, I'd fully explore that before moving forwards with sensors...they're electronic, meaning no returns to the autoparts store...sucks!

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Q: What would cause a 97 intrepid to run rough stall and have check engine light on-already changed plugs wires and fuel pump?
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