Q: Q: Rough Start

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Hello! I have a 2003 Lincoln Ls V8. Only sometimes when I start the car up, it idles a little rough until I get moving. Then it runs fine. Other times when I start it, the car feels like it wants to stall out. But again, once I give it gas, it's perfectly fine. I also noticed a werid smell coming from the exhaust and I've lost a little bit of gas mileage and acceleration no check engine light. Can you help?

My car has 74000 miles.
My car has an automatic transmission.

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