Why does A 1998 gmc sonoma go in and out of overdrive while driving?

The 1998 GMC Sonoma may experience issues with overdrive engaging and disengaging due to several factors, such as a faulty transmission control module, low Transmission Fluid levels, or a malfunctioning throttle position sensor. Additionally, issues with the vehicle's speed sensor or transmission solenoids can also cause erratic behavior in the overdrive system. It's important to have the vehicle diagnosed by a professional to pinpoint the exact cause and ensure proper repairs. Regular maintenance can help prevent such issues.