1999 Chevy Astro What could it be

1999 CHEVROLET ASTRO
151,233 MILES • 6 CYL • 2WD • AUTOMATIC
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JOSE89
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My problem in my chevy astro 1999 is that when runing the van in 25 -30 mph the Antilock light shows up in the dash board and the needle starts going up and down like crazy and it wont run properly its like shaking the truck
Aug 8, 2008 at 5:26 PM
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BLACKOP555
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do you have 4 wheel anti lock brakes or just rear wheel antilock brakes?

you talking about speedometer needle?

does vehiclel run fine no surging during this time?
Aug 8, 2008 at 8:17 PM
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JOSE89
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I really dont know when I start driving the speedometer starts going up and down and the anti lock light in the dashboard turns on and I press the gas pedal and it sounds like if it doesnt run
Aug 9, 2008 at 1:29 PM
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BLACKOP555
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i would have the computer scanned for trouble codes, may be something happening with the 4wabs module if equipped. or vss.
Aug 9, 2008 at 4:34 PM
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