:madwell i'm getting fed up with this situation and my car.2000 740i sport.same problem ,starting issues,i have replaced fuel filter ,pump,relays,now new coils ,soon to be injectors(sitting on tool box).car has been fine and then it just turns over.run only shell premeium gas.left work wendsday,got in car turn key ,rrrrrr,rrrrrrrr,got out waited 40 min. same thing over and over.sat in car shuck side to side,wham car starts.stopped at store got back in rrrrrrr.sat there for twenty minutes,not touching anything.boom starts up.help!!!!this is driving me nuts and broke.i don't get any codes .and i'hve also replace the maf to.one time at a shop they sprayed starting fluid in through the maf,and that helped.but before i go through the process of replacing my injectors ,which i'm going to do anyway,since already purchaced,am i missing something or is it time to just call it quits?