Tryin' to figure this one out. I've got an e28 with an m30 motor that idles rough when first started for about 20 seconds ONLY when it's hot. Plugs and wires are good, has newer idle valve,new fuel lines and filter. Fuel pressure jumps to around 45 psi when started and stays right there as it's idling rough, then all of a sudden it comes out of it and drives perfectly. It's got to sit for about 20 min to do it. When I start it cold,no problems. Cold start inj sticking maybe, or a coolant sensor? I appreciate any insight.