Smokin 750HP Supercharged Club
Join Date: Oct 2008
Location: New Milford, CT
I agree with Marv02, an Idle Air Control valve is a possibility.
I would agree with Slvrvette only if the OP's condition got progressively worse. If it just one day started running like garbage, that sounds more like a faulty component, unless of course a vac line got disconnected.
Either way all are good suggestions; be sure to give your car a thorough diagnosis and as was stated by others, don't just throw your money away at what you think is wrong.