My car idles at around 1500 rpm and then drops to the point where the car nearly stalls, catches itself, and the tach jumps back up to ~1500. When not accelerating it jumps back and forth, sputtering. I have changed fuel filter, spark plugs and wires, checked the distributor cap and can't find the solution. Online, I have read solutions ranging from PCV (ordered), o2 sensor, idle air control valve among others. I don't have a whole lot of extra money right now so I'd like to know if someone had the same problem and what they did to fix it. Thanks for your help!