in between my jeep is purring like a kitten with the emu

I'm sorting out smaller Probs. For example - Engine start.
It takes 1,5-2 seconds to rev up. this is not necessary, because....
Turning the key, at 90% of the starts there is a rpm jump up to 5000-7000 rpm in the first second.
Look at my log/picture.
Whats that? This is NOT my HighPerformanceStarter

When this rpm-jumps occures - fuelcut comes into game and the injectors will not squirt until FC is over!?
(not completely right - they start, when RPMs are going down)
Two questions:
1. how can I avoid this rpm Jump
2. why there comes fuelcut???
Greetings
Michael