So I've seen this in autos before when the car will be sitting in park or at a light and the rpms will drop down to like 100 or 200 and then bounce up to 7 or 800 but on mine it's dropping down to like 100 it will do it a few times then die it only does it when I'm let it warm up or when I'm at a light what do you all think the problem could be I've adjusted the idle, bleed the coolent, no vacuum leaks what so ever