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What could possibly be wrong with my car it starts up but does not want to idle
 

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Is the check engine light on? If so, do you have an OBD2 reader and can check the codes that it's throwing? How long has it been since the plugs/wires have been changed? How many miles on it? There are about a million different things that could keep your car from idling smoothly from bad plugs to vacuum leaks to damaged pistons. When did it start and did you do anything just prior to it having this issue?
 

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sounds like a similar issue i had with a 2005 zx3. no check engine light, car would not idle and die once you let off the gas. turned out to be the mass airflow sensor was the issue.
 
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