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Q:

why does the vehicle tend to lurch forward as it builds speed. on 1990 Dodge Caravan

Rookie cbe0621eac06868b3efe0d8d1d3611e23c60d3114864ea2ec19a68cfbd3eebab
vehicle jerks or stalls at speeds in the low range up to 65 mph then it tends to remain reasonably good. seems to have poor power all along its building rpms.
(1) Answer
It's the transaxle...check that fluid is or has been changed. Then next....check the bands. It's a subtle transition of strange gains and losses at certain speeds...wich at first one would think "engine" but...I've discovered it's torquage from the tranny pullification. Hope this works for you. Check bands.