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1st check fuel filter, air filter, fuel pump. You may also want to run some fuel injector cleaner (or carb cleaner if it's an 88 or 89 without FI).
Also check for any vacume lines which may be split or have come off, check the oil cap and oil dipstick are on tight (seriously), and check the PCV valve is in place and not clogged (you can pull the PCV valve out and shake it up and down. It should rattle just a bit. If not, it's clogged).
If it's only recently started idling improperly, it could be bad gas as well.
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How do you set timing for a 1997 Ford Festiva?
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