Purchased a 1998 3/4 dodge with a 12 valve with 5 speed, it is idling real low, around 500 rpm. I know how to fix it but i have a short list of questions. 1. What is the exact idle rpm supposed to be. Around 900 or so rite ? 2. How much turn on the idle screw will get the rpms up to where they need to be ? 3. What does the high idle screw do ? 4. And how do I plug the waste gate on the turbo to make it spool faster ?