why do my jeep run like shit when you drive it it jumps dont want to take the ga on 1997 Jeep Wrangler

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it runs fine when it setts an run but u put it in gear an drive it it want take the gas an it backfires an it spites sputers an jump an hadit on a computor to see what it is an no luck so i would lie some help in findeing out what i need to do
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