I've been working on my project e30 and just started it up yesterday. First time in about a week or so. It was idling at about 1300 or so, I reved it a few times and it stayed around 12 even after it was warmed up, I put it in gear and drove in around my driveway and after when idling the rpm drops to about 600 and jumps to 1300 and keeps repeating this.. I have no idea what this is.. hopefully nothing serious. I started it up today and it did the same thing.. Its almost out of fuel, on empty, i dunno if that has anythign to do with it..