Quote Originally Posted by thegoose View Post
Hi all. This is my first post on this forum and I hope you can help. Bought an '07 Grand Prix for my son for school and have noticed a bucking/surging with RPM oscillating around a few hundred revs when under light throttle on a slight upgrade. At first I thought it may be shudder from Torque Converter but can also happen when selector is in 3rd gear. Accelerating seems to cure it. Any thoughts will be appreciated. Thanks
Over winter the boy's battery wouldn't start the car. (You wouldn't either in -40 C. ) Anyways, put the battery charger on and the battery was showing only 4.7 volts. Charged 'er up to fully charged and have noticed that revs don't occilate any more as they did before. Perhaps the TCM was reset?-IDK. But he has a car that I fell will last until he has finished University hopefully without a burnt out tranny. (Will be installing a Hayden tranny cooler this summer with the thermal bypass for our polar bear winters)

BTW, a big thanks to ALL members who post questions and those who try to help them. That's the name of the game ,right?