when i turn the key, the car gets goin for a split second to around 500 rpms, then it cuts off. if i unplug the afm, the car starts up to 750 rpms and sometimes chills for a second before dying. is this a bad afm that i have? if not, what else might it be. everything is plugged in, no vac leaks, fuel pressure is there, oil pres is there, compression is within spec... what should i be looking at? thanks in advance.