Question about 2000 GMC New Sierra 1500

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Tachometer jumps above operating speeds and bucks frequently at highway speeds. Note, just recently had intake gasket replaced.

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I dont think your problem is related to the intake manifold gasket.My experiance leads me to believe that your speed sensor is bad(VSS) Back in the day it was a cable attached to the tranny that gave you mph on your dash.In today's "fly by wire" society this would be the most likely suspect.symtoms would include downshifting for no reason your speedometer would drop to 0 and the tach would skyrocket.Vehicle may come right out of it and operate normally,or it may continue to buck for a while and then even out.I would start there.

Posted on Mar 14, 2011

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