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i am no expert but if it were me i would also check the throttle positioning sensor thats on the throttle body , you would have to remove it and using a ohm meter, check that the resistance changes smoothly as you turn it.i think the resistance should change from about 560 ohms to about 4,900 ohms .
autozone can read most codes i think , but if you have no service engine light on it may not throw a code.
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