Hi, I am new here so hope I am doing this right. I have a 92 Lumina 3.1, just turned yesterday 253,000 miles. I am having trouble with the idle and it running at the low speeds. If you get it over 65 it runs like a champ. But under that and the lower the worse it jerks and when you come to a stop sign or light it will shut off. It will restart but it idles ruff. This is what I have replaced on it.
New plugs, wires, catalytic convertor, new exhaust, exhaust donuts, radiator, struts, fuel filter, throttle position sensor, IAC. Most of these items were not replaced due to this problem I just wanted you to know what has been replaced.
Now at low speeds I get to a spot that it vibrates like its going over rumble strips then if you continue to press the accelerator (easy) it will get pass that. If you press the accelerator to fast then the tranny drags and then slams into the next gear or passing gear depending on how fast you go. Now it did lack power up hills and smell really bad but that turned out to be the catalytic converter. Once its over 60-65 you would never know anything is wrong with it. The warmer it is the more apt it is to shut off at lights and stop signs but never shuts off. But it has not shut off just going down the road but you could get whip lash if not careful.
Thanks for any help or suggestion you could give. Cj