- is it happening when you gas during idle/neutral?
if yes then not tranny issue
- is there any code being thrown?
this car checks itself all the time. if there is a tranny problem it's likely it would be detected.
- does it do the same when you reverse?
i know it's hard to drive reverse that fast. but just checking it in an empty parking lot probably won't hurt
- anyone drove it during your vacation?
you will be pissed if someone else screwed it up..lolz.