Question about 1990 GMC Sierra
Check the TV cable to the transmission that is hooked to the throttle body. Sounds like it needs adjusted or hooked back up. Sometimes they also stick in the transmission, Try adjusting it first. You need to make it longer to lower the shift points. If this doesn't work let me know. It is likely stuck in the transmission and there is a trick to getting it unstuck.
Posted on Jul 18, 2010
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Posted on Jan 02, 2017
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