thank god for having that limiter if not ur car will blow up.
is a fuel cutoff so u wont kill ur car, and why would u want to go above 5rpm while in park.

oh wait it wont go over 4-5rpm while driving it mmm there is something wrong then. how miles the car have? maybe when they did the timing they did it wrong. u should be able to red line it while driving like around 80mph for our slow auto.