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What causes engine to jerk?

(1990 Chevrolet Astro)
in Danville, AL on January 17, 2016
I have already changed the spark plugs. changed fuel filter. Had water in it. Put gas treatment in tank.
still jerking. Is an 88 but year not on field to fill outl
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Popular Answer
on January 18, 2016
Did you have the plug wires changed also?
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