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What causes engine to jerk?
1990 Chevrolet Astro

What causes engine to jerk?

(1990 Chevrolet Astro)
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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on January 18, 2016
Did you have the plug wires changed also?
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on January 18, 2016
Did you have the plug wires changed also?
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135,000 miles. sometimes it gives a jerky motion when stopping and going. could it possibly be the transmission?