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Water in the fuel filter, or possibly a fuel pump going bad. I would check the filter first.

It could be the fuel pump going bad. If you take out the fuel assembly underneath the back seat check the fuel filter sock to see if it is covered in a brown looking substance. If it is you will probably have to replace the gas tank. My91 festiva had a rusting gas tank after sitting for a few months and all the corrosion was getting sucked up and caught in the filter. After it got down to half a tank of gas it would loose power and start sputtering out until it would stall. I replaced the tank and it runs great now.

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Q: Why does your 1991 Ford Festiva run smoothly then start lagging but when you turn the key off for three seconds then back on it smooths out again for the next few miles Has done this for a year?
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4-letter words beginning with o?

Some 4-letter words that start with O:oaksoakyoarsoastoathoatsobeyoboeoddsodesodoroffsogleogreoilsoilyoinkokayokraoleoolioomenomitonesonlyontoonusonyxoozeopahopalopenoptsopusoralorcaorgyoticouchoursoustovalovenoverovumowedowerowesowlsownsoxenOars, oath, obey, oboe, odds, oily, oink, okay, omen, omit, once, only, onto, open and ouch are 4 letter words. Additional words include ours, outs, oval, oven, over, owed, owls, owns and oxen.4 letter words O: * oath * over * oven * only * onyx * ooze * oven * omit * odor * oboe * ovum * open * odds * omen * oily * ocra * opal * opus * oral * oryx * ouch * ooze * owes * ownsoval, open, owls, olay, oats, onlyonus* opus * oven * over * oval * oxen * only * orgy * omit * oath * ogle * oars * odds * obey * oboe * onto * odor * ogre * oily * okra * omen * open * oral * ouch * ours * oustopen.order.option,otherFour letter words beginning with O are: ogreokraoleoomenonceonusopalopenorcaouchoustovalovenoverovumA four letter word starting with an "o" is: OVERopal open obey obit oboe odor odds okra olio omit omen only onto onyx onus ooze oozy opus oral orca ouch oryx oust ovum oxen over oval ovenoaksoarsoastoatsobisoddsodeaodesodoroffsogreoilsoinkokayoleoolioomenonceonlyontoonusonyxoopsoozeopahopalopenoptsopusoralorbsorcaorcsoresortsoticouchoursoustoutsovalovenoverovumowesowedowerowlsownsoxenoxer