i have a question,what would cause a 99 a-4 z-28 to get into the rev limiter before it shifts when under wot.this has happened 2 times to me and it freaked me out both times.car only has 30 grand on it and is stock save for fra.car was not up to temp when it did this on both occasions.could that be the problem or am i looking at a new tranny here.