So i did the DIY throttle mod to remove dead space, and first when i put it back in the throttle woudnt work so i turn it off turn it on agian throttle works but i dont see a difference , then another potential problem is i reved it in neutral to make sure it was smooth at least, after 4 grand mydash say parking brake on(and it is on since i am reving at a stand still)and my speedometer moves to about 1-2 mph. is this normal, is this because the whole car shakes when you rev high, i am a lil worried about this.