So the "Service Engine Soon" light finally came on. The people at Aamco pulled a code for the Park Reverse Neutral Drive switch. I forget the exact code number, I will find out tomorrow when I go back to Aamco. But the guy at Aamco says all the symptoms fit, and replacing that switch should make my tranny shift fine. Does anyone have any experience with this switch and the problems it can cause???????? THANKS.