Question about 1998 GMC Sierra

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SHIFT IS UP AND DOWN BETWEEN 40 AND 50 MPH.98 gmc sierra 4x4

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You may have a worn throttle position sensor that is erratic at those speeds. The engine computer may or may not pick up on this defect--take the truck to Autozone or similar business for a free computer scan. You need an oscilloscope to prove the part to be defective as it shows up on the scope as a series of noise pulses on what is normally a smooth rise and fall of voltage from the sensor. Hope this fixes your problem!

Posted on Jan 30, 2010

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That is the torque converter lock up. they do that on those trucks the best thing to do is to shut off the over drive

Posted on Jan 30, 2010

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