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Is it fuel injected? Might be the idle air control valve. I had a 89 Crown Vic that had similar symtoms. It would start fine though, just had problems idling, especially when cold. Bought the idle air control valve and noticed alot of carbon when taking the old one off. For grins I cleaned up the the carbon and re-installed. It worked great and I never installed the new one. Still have it somewhere I'm sure.
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