#4 misfire, high intake air codes are coming up

2001 OLDSMOBILE ALERO
175,000 MILES
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KIMBERLEY2421
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Already changed the head gaskets new spark plugs and wires the car isnt overheating whats wrong changed the head gaskets thermostat water pump spark plugs wires car has a complete makeover were did i go wrong
Dec 4, 2011 at 12:47 PM
Repair Safety Notice: This information is for general instructional purposes only. Vehicle repair can be dangerous. Verify all information, follow manufacturer service procedures, use proper tools and safety equipment, and consult a qualified repair shop when needed.
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