ok so here's the problem. sometimes when i let out the clutch to start to brake the rpms will go down until the car just dies. other times when i let out the clutch they go down really low like 500 then it catches it and they kinda bounce around 1000-1500 for a bit, then it's ok. and sometimes its just normal. i do have a fidanza flywheel. would that have anything to do with it? what might cause this and how can i fix it? help will be greatly appreciated.