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Q:

antilock light is on speedometer and engine become erratic when cruising on 1997 Chevrolet Astro

Rookie cbe0621eac06868b3efe0d8d1d3611e23c60d3114864ea2ec19a68cfbd3eebab
when starting the antilock system resets as it should. when going forward the antilock ight comes on immediatly and speedometer becomes erratic. engine rpm tends to follow the erratic behaviour of the speedometer.
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