1990 GMC Sierra acceleration

1990 GMC SIERRA
160,000 MILES • V8 • 4WD • AUTOMATIC
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AKAFOX
  • MEMBER
  • 1 POST
when I am driving and accelerat, the engine sounds like it is speeding up, but the truck wont go faster than 50 mph, now it wont go over 20. No noise, just like the transmission is kind of slipping?
Oct 11, 2010 at 5:28 AM
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WRENCHTECH
  • ✓Experienced Mechanic
  • 20,760 POSTS
Are the RPMs going up without the speed going up?
Oct 11, 2010 at 5:52 AM
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