This has been covered a few times before. Your ECU will not allow you to rev past 5000 RPMs. I know I was an idiot once and tried it too. Here is a quote from a thread titled "rev limiter question"
Originally Posted by spyderbret
For anyone interested, I found out that the ECU will not let you rev your engine past 5000 rpm when in neutral or park.
Hey Jerry's kid, he has an automatic, he said so in the last line of his first post.