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Q: Problems staring when cold on 2006 Lincoln Zephyr

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i started experincing this in nov the battery was low dealership replaced it. Problem continued they replaced fuel pum , plugs did work on manifold very costley repair. Car still wont start when cold. I have also noticed it runs and starts better when over half tank of gas. Have tried adding dry gas, letting car sit for a while before driving. intermittently it runs very rough.
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