Well, my Grand Prix shutters at 45mph and stops at 50mph I read somewhere that a guy switched out his kickdown cable and the shuttering stopped, so I was going to try to switch it out too. If it doesn't have a kickdown cable I suppose i'll have to find another way and research it more, would you happen to know if the shift cable could have anything to do with it?
(i purchased a used grand prix, got it scanned, no codes and checked it out and appears nothing is wrong with it. But I purchased vehicle before looking up well known issues and unfortunatly found out this is one of them. The shuttering at 45mph.)
Friday, February 25th, 2011 AT 5:20 AM