Hi. I am going through the nearly the exact same problem, though so far it's happening intermittently. It's driving me insane. I'm not very mechanically inclined, so I don't really understand all the acronyms you refer to. I have changed my plugs, my fuel filter and done a variety of other routine maintenance. I get no CEL (figured that one out) and, of course, nothing shows up on the quickie diagnostic. I have had a million people suggest a million different things, but the most common to date are the Idle Speed (Air) Control Sensor or the Throttle position sensor, which can be found on opposite ends of each other. The ISCS is a way expense part,while the other is about $30 new. My local Toyota dealer has offered to check the ISCS this afternoon, diagnostically, and I hope to get them to do a quickie on the other part. Not sure if this will show good/bad since it's an intermittent problem, but, like you, I'm going through the process of elimination. I will let you know the results. Could you please let me know what some of the acronyms are that you are referring to? I'm figuring since they didn't help you, it won't help me either, but it'll be good to know. You can reply here or even call my cell at 904-314-3276. My name is Jim.
We must beat this thing!!!!!!!
